Is an Honors/AP track, CTY alumni going to be bored silly at TAMU-Galveston? Other Naval Arch/Marine Eng schools (MIT, Michigan, Webb) are insanely competitive.
Why don't you go to A&M College Station. From here; ENGE Status of Space Available
There's four more spots for Ocean Engineering. Probably would be more challenging/better for you there than at Galveston.