Lick Creek Park, College Station
This is more ON the beaten track I suppose. It's a State Park and absolutely brilliant for dog walking and birdwatching. We went for a good 3 hour walk and I played with and chased the dogs and hubby looked for birds. Good healthy excercise and the temperature was not too hot in March, around 73oF /21oC. It was also good for overactive teenagers!
The website below gives you a comprehensive over view of the activities there and the conservation and research being carried out.
It's free to enter and use and the paths are well marked.