I'll second the Hwy 6 through Aggieland to Hwy 105 from Navasota to Beaumont, then drop down to I-10. You will be much happier than having to deal with our lovely Houston traffic and apparent continuous road construction... The US290 to I-10 interchange is brand new, and the traffic is still gnarled up there daily.
No real park suggestions as we are generally trying to make miles and only looking for an overnight when we make the Destin run (the kiddos want the fastest route to the beach!).
Current TV:'14 F350 Lariat CrewCab, 4x4 Short Bed SRW Diesel w/ Pullrite 2700 (16K)
Current Fiver: '15 Puma 295BHSS Anniversary Edition
Past TV: '13 F150 HD Payload SCrew EB, '08 Tundra CrewMax 5.7L, '02 'Burb 5.3L, '97 Dakota 3.9L
Past Trailers: '09 Wildwood LE 27RB, '02 Palomino Yearling RL, '87 Jayco 1006dlx