The MXT in salt mode should allow you to use any coil that you want Bob. On the low mineralized white sandy beaches of Mexico you could expect depths of 12 inches with the Bigfoot on larger coins, less on smaller jewelry and small coins. The beaches are packed during the sunny "prime-time" so detecting would be best from sun up to about 9 AM and again, the last couple of hours before sunset. The entire beach of Mexico belongs to the government and is open to detecting, so you are not limited to just your resort area. For Nancy and I, we liked to cover the most area in the shortest amount of allowed time, but the other method is to hunt slow and deep to find what others have passed up. Of course, the prime place to hunt for gold is in the water with a water machine and I bought a Beachhunter ID just for that reason when we went. Unfortunately, the surf was rough while we were down there and all of our hunting was limited to the dry sand.
You should have a blast hunting there as we did. We found enough peso's to leave a very nice tip for the maid for the entire week and still had enough left over to buy a round of refreshments for our party of six before boarding the plane and still brought back memento's from the hunt. The cherry on the top was finding and returning to owners, two lost rings.
Mexico would be a great choice for a getaway/hunting vacation.
