See the following site for park information and trail map.
http://www.tpwd.state.tx.us/spdest/findadest/parks/caddo_lake/
See this site for more great pictures of the lake.
http://www.caddo-lake.net/
We stayed in the guesthouse (aka mobile home) of Bell's View. The setting is gorgeous....our friends and I had a great time. They do have a really nice hot tub, and the B&B part looked nicer than the guesthouse (which was a little rough around the edges but nice overall). See their website for information and beautiful pictures of the lake.
http://www.bellsview.com/guest_house.htm
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