we really enjoyed the night time shows at Seaworld, they do Shamu Rocks which is a Shamu show with lights and rock music that it really fun, and then this is followed by a fireworks show at the waterskiing stadium, where they project images onto water (similiar to fantasmic). It is quite impressive.
I also believe there is a Luau which is a seperate charge, which I haven't done, but I think that looks good too.
Bev