Consider hiring a cab for the day to do that. A DWI in Mexico wouldn't be much fun, and neither is being the designated driver.Rent a convertible beetle from Margarita at ISIS and drive the southern Island loop. We did that on a day where I wasn't feeling well enough to dive. We stopped at the various bars along the way and anything else that tickled our fancy. It was a nice day to just be out and about in the sunshine.