i just come down to ambergis caye from playa del carmen , travelled by car to corozal, then flew over, great and not exspensive. diving is spectacular, lots more fish life than cozumel excellent reef formation. there are lots of hotels which are not exspensive but im stayin at pedros which is like a hostel very comfortable and cheap.some dive stores charge around $100 for two tanks others $75 so best to check but they are good and professional. i cant say to much more as its all been said but youll have a blast. enjoy