Like everywhere else it seems, housing is going up at Trinity. I just looked at a place there that was I believe 1200 square feet on a good size lot in Trinity Center and it was $179K, but down on the lake (actually, the airport) they're getting over $500K. There are other places around the lake though, just not as close to the water.
I've gone there every year for most of my life, and it's my favorite lake. It can get windy, and I've seen it dry up to a puddle during big droughts, but for the most part it's great. Last year on the 4th of July it was glass all day and hardly any boats. I'd stay to the north end of the lake (Wyntoon, Trinity Center) if you're looking to buy...it's less crowded there and the water is usually better.