Shore dive to the Wreck of the "Liberty". Because of the stone beach a little careful water entry. Sea bottom further on black sand because of the vulcanic origin. Wreck itself is an oase of marine life. Shallow and broken enough for easy acces and exploration. Plenty of parking is available on site. Air fills are found at dive shops around dive site, but not on the actual site itself. Very crowded during diving seasons (or so the guide told me), but usually pretty good number of divers are around you.
More info
http://www.shorediving.com/Earth/Pacific/Bali/USAT/index.htmFrom SportDiver Planet’s 50 Greatest Dives, #35, One of the world’s best wrecks accessible from shore, the USAT Liberty was a casualty of Japanese torpedoes in World War II, left abandoned on Tulamben’s rocky beach, then pushed 100 feet offshore by lava from Mount Agung’s 1963 eruption. Snorkelers can glimpse the Liberty in just 10 feet of water, but you’ll be glad you’ve strapped on tanks to relish the deeper, wide-angle views of a wreck encrusted with sponges and corals, and macro treasures like ghost pipefish, pygmy seahorses and nudibranchs. — TW
http://www.sportdiver.com/photos/planets-50-greatest-dives?cmpid=enews011713&PodID=030&spMailingID=14460532&spUserID=NzY5MDMwNzA0OQS2&spJobID=210377095&spReportId=MjEwMzc3MDk1S0