Remember, most Chicas don't swim. Some are pretty terrified of the ocean, so la playa doesn't always hold all the charms you might think it does.

good luck dude, you usually have to build trust and rapport to get the chicas to go to your own hotel room outside of the Zone in TJ.
There are almost no chicas available in Rosarito.
It's best to take the 20 minute drive up the highway to TJ for some fun. Hang out in TJ the first night at the usual clubs and if you hit if off with a chica, she may go take an extended tour, but remember, many of the chicas have little ones at home and can't be gone that long.