All girls to PI. Men; either or based on your geographical location. If you want a preference that bad then demand it from your recruiter or you will not go in.
Also, I would definitely take San Diego during the winter and stay away from PI during the summer and those little sand fleas!
Only bad thing of San Diego is you are next to an airport and at first it makes you homesick, but they have unemployed people sitting in chairs on that side to catch you and get a reward.
Both are definitely tougher than the disneyland theme parks the army, air farce, and navy attend!