The areas where this water mixes with the colder Pacific water produce great fishing for large game fish. To find just about anything you would want to know about fishing off the Baja coast, visit Amigos de Baja Bajanet . This site has everything for the fisher and traveler. Fishing charter boats can be found in every coastal city. Many fishers maintain that you haven't really fished until you have caught and released a fighting Marlin.
Golf courses require a lot of water, and many areas of Mexico are dry.
Water is too precious to use for irrigating non-agriculture areas. There are probably many more. Some Mexican parks do have trails though, as do some of the volcanos. There can be miles of deserted continuous beaches to hike. I have personally walk beaches and not seen another person for ten miles.