Mhenry, I just answered a question for someone the other day about what places in Brittany might be worth visiting. I'm going to copy the reply I sent them below. Some of the info may or may not be relevant but you can decide what is helpful to you. First, however, let me give you some info about biking in Brittany. You should go to the website
www.freewheelingfrance.com, which is an excellent resource for biking in France. Click on the "Where to go" tab and there are about 6 pages to scroll through dealing with biking in various parts of France. There are several topics devoted to biking in Brittany and I'd be surprised if you didn't find most of your questions answered here. Lots of other helpful info about biking in France on this website. Here is the reply I sent someone the other day in regards to Brittany. Hope you find it helpful:
I think the first thing to do would be to get yourself a good guidebook or two on Brittany to learn about the region (I like The Michelin Green Guide). The most visited spots in Brittany tend to be coastal locations. Although inland Brittany is nice too I think you would be happiest being in a coastal location (esp. in August) and visiting any desired inland locations as day trips. I think there are essentially three main coastal locations you should consider: 1) The Gulf of Morbihan 2) Finistère 3) The Côte de Granit Rose. In the Gulf of Morbihan I think the two towns that will give you the most in terms of a wide variety of services, restaurants and amenities within walking distance are Carnac and Quiberon. If you don't mind being in a small city then I think Vannes is a lovely place to stay as well. You may have already read my trip report about spending a week in the Gulf of Morbihan but if not I'll give you a link to it. It is full of photos and descriptions of what to see and do in the area. Here is the link:
tinyurl.com/2555vafFurther up the coast you have the Finistère region, which has a beautiful, rugged coastline. The main towns of interest here would be Pont-Aven, Concarneau, Bénodet, Douarnenez, Locronan and perhaps also Pont-l'Abbé and Châteaulin. And again, if you don't mind small cities then Quimper is also a lovely place. I think any of the places I mentioned in this region would make you happy.
In the northern part of Brittany you have the Côte de Granit Rose and the coastal area that runs east of here all the way to the Côte du Goëlo. This whole coastal area could be defined as running from Trébeurden in the west to Saint-Quay-Portrieux in the east. I think the towns with the most services to offer here would be Perros-Guirec and Paimpol. Two nice but small cities (and they are really more like larger towns) would be Guingamp and Morlaix. A couple of other places in this region you might consider could be Landivisiau and Carantec but it's been several years since I've been to these two places and I'm having a hard time remembering much about them. You might want to see what the guidebooks say about them.
In any of the regions I mentioned there are loads of smaller towns that are worth staying in but I only mentioned the places that really offer the largest amount of restaurant selections, since that seemed to be an important criteria to you. The only notable Brittany locations I haven't mentioned are Saint-Malo/Dinard/Dinan (all near Mont-Saint-Michel) because I assumed you were familiar with these places.
Let me give you a few other useful general tips to help you plan your trip. These are standard responses I have posted many times and they can be applied to any region in France. Here they are:
Get your hands on the Michelin maps (scale of 1:200,000) for whatever regions you visit. The Michelin maps have icons for all kinds of historically/touristically interesting things such as châteaux, ruins, churches, abbeys, scenic view points, caves, Roman sites, megaliths, designated scenic roads and many other things. Usually when I'm exploring various regions in France I just look at the map and I am able to plan interesting and scenic drives just reading the map. For instance, I usually look for a designated scenic road, which are highlighted in green, and I especially look for towns with the historic church and/or château icon. I also try to make sure the route goes through as many small villages as possible. Usually putting all these things together I find interesting and scenic drives without even knowing where I am going and with no assistance from a guide book. Often these places are never mentioned in guidebooks and remain completely unknown to many tourists. In addition to the Michelin Green Guides (which I mentioned previously) if you need restaurant info then get The Michelin Red Guides, which cover restaurants.
You can buy the Michelin maps from their website and here is a link to the page that shows all of the maps of France:
tinyurl.com/4bt96evAnd speaking of Michelin, you can go to the website viamichelin.com and get info on drive times and distances, toll and fuel costs and suggested routes (i.e. scenic routes). The drive times given do not consider stops (fuel, food, bathrooms) nor do they consider bad weather and traffic.
You should google some of the town/tourist office websites for any towns you may want to visit. You will find loads of info on these websites including hotel/accommodation and restaurant info as well as what to see and do in the area. Occasionally the websites have English versions. In doing a google search enter the name of your town followed by the words "site officiel" or "office de tourisme" and this will bring the town to the top of your search. Another thing I like to do to see if a town may be worth visiting is enter the town name in a google search followed by the word "photos". Sometimes I visit a town if I find it looks charming/interesting in photos.
It sounds like you know how to find your own accommodation but in case not here are some tips. There are many websites where you can search for self-catering accommodation in France. The two that I always use are:
www.abritel.frwww.homelidays.comHere are links to several more:
www.gites-de-france.comwww.clevacances.comwww.holiday-rentals.co.ukwww.frenchconnections.co.ukwww.papvacances.comwww.cheznous.comwww.vacationinfrance.comwww.francelodge.comwww.vrbo.comwww.ownersdirect.co.ukI think that's about all the advice I have for now. Let me know if it helped you and if you have any other questions I'll see if I have anything more to add.
Let the riot begin! LOL - 
hahahha