for a day if you'd like. Even the snorkeling can be fantastic in Coz, but the best stuff is 40'+ down. We took an introductory SCUBA dive in Coz off of a cruise ship, 15 years later the whole family is certified including spouses and we've been back a dozen times. Not great beaches though, so if you're not a diver I'd go somewhere else, although the pace is very slow over there and there are terrific restaurants. The beaches on Coz are sort of man-made, so the beach clubs are nice but overrun with cruisers when the ships are in.