It looks like a good place to canoe or yak into for a primative camping site,(or just for fun) better park map at the state web site) the lake is 350 plus acres. (They do rent canoes, kayak and paddleboats for $11 for first hour, $5 per hour after. Special 6 hour rate of $22 (March 2008 price)
TPWD: Purtis Creek State Park