Huntsville State Park
*On Park Rd 40 - which is the same exit for the Sam Houston Monument
*Nearly all of the park is heavily shaded
*Horse rentals (and I'm thinking canoes, too) are available
*Nice mix of shelters, day use, camping, and full hook-ups, but this is another 100+ site campground, so potentially could be very busy
*Electric and Water Sites: Raven Hill Camping Area: Sites 49, 51 or 53 have views of the 'lagoon' (it was covered in lilly pads when I was there) Group Sites: 19 &21, 28 & 29 would be good, 56, 57, & 58 as well, also look at 47, 36, & 48 as they back into each other and are right across from the playground.
Prairie Branch Camping Area: Sites 146 & 147 would be group sites, with 146 being a "premo" stand alone - these face the lake.
*Shelter Sites - 13, 12, & 10: keep in mind, if you're booking a shelter sites, your pup and TV both have to be on your pad, no parking is allowed on the camp road.
We stayed here Feb '13: It's A Wonderful Life
And again in August '13: It's Nice Outside