I would bring it along, dont expect to find much. I have done this several times, mostly after big holiday weekends, Semana Santa etc. when the beaches were packed. I found lots of hotel keys, bullets, and enough coins to pay for the detectors batteries and buy a cold beer after. It was a lot of fun. Dont be surprised when you get a few locals and hotel security guards crowd around to see what your digging for, they even helped dig too. I never checked in the water, but you see a lot of guys snokerling every Mon. morning, they find some jewlery. All in all its a lot of fun, you should have no problems from anyone, I never did. Good luck.
Campesino...
