Update: I am still in PV, but wanted to post an update. I am staying up at the Vidata resorts in Nuevo Vallarta. Been MDing 3 times and boy, what a disappointment. First time was beach hunting along dry sand and waters edge. I was shocked to get no signals, not even junk. I was getting really lonely to the point that an iron signal would be welcome. Really surprised. Cleanest beach I have ever hit. After a 3 hour hunt, absolutely nothing except a few pieces of can-slaw which I welcomed. Was starting to wonder if my detector was even working.
So, I figured I needed to do some water detecting. First time doing that. Went first thing in the morning and water was a little rough, but still spent 2 hours in the water going back and forth and nothing! Not even an iron signal out there. So since I was on a different section from my first hunt, went back to detecting the surf area. Was low tide and got a few junk iron signals. Then recovered two beer tabs, boy was I stoked! Ha, ha. All in all, another 3 hour hunt with nothing to show for it.
To all who have asked if MDing is ok in Mexico, yes, beach detecting is no problem. All of the staff had no problem with it. I did also call the guys at Master Detector up in Monterrey before I left and they confirmed the same thing. Hotels will try to say that they beach is their private beach, so they may ask you to leave if you are not staying there.
So, I still have another week here, but need to get creative. Took my MD with and have found nothing. Will advise if that changes.