Britney Spears BSpearsBikini051908_01_X17.jpgBrit's already back in LA, but watch her in action in Costa Rica here on X17!

Our girl Brit seemed to be having a great time frolicking in the waves (despite wiping out on her boogie board), with maybe boyfriend Jason Trawick while dad Jamie caught the whole thing on his own camcorder!

At one point in the vid, Brit even wound up on the sand, looking like she was gonna attempt a back flip, but got cold feet and chickened out.

Was she trying to show off for Jason or just having some good old-fashioned fun?

We've got even more video of the group living la pura vida in Costa Rica, so stay tuned!