It depends on the diving you like. Caves are about twelve hours away. The largest artificial wreck in the world, Oriskany, has been recently sunk nine hours away in Pensacola, FL. The Flower Gardens are just an hour and a half drive to Freeport where you catch a liveaboard (Flower Gardens are 110 miles out in the Gulf). I'd recommend the
M/V Spree. CCRs are permitted but I'm pretty sure not the Dolphin. Please verify with Capt. Frank though. There is also some rig diving but the vis is not glorious unless you do High Island 389A while diving in the Flower Gardens on the M/V Spree. In a month or two there will be a nice, new, large, wreck (Texas Clipper), that will be sunk in Padre Island (nine hours away or something like that). And then there is the diving theme park,
Mammoth Lake, that will be ready soon. It's only an hour and half drive.
Bring your dive gear. :-)