I have stayed in the Lake Theo Tent Camping Area several times - ranging from 110° days in May through perfect 75° days in July. Shaded sites go quickly, so be sure to spend extra time studying the map. The campsites are a short walk from a swimming hole and fishing area. There are often paddleboats and boards lolling around the no-wake lake. The trails are lovely, and if you catch site of the Texas State Bison herd, you'll fall in love with the park. Amazing bat-watching as well!