Tidal streams in Badung Strait are semi-diurnal, but the character of the stream is very complicated because its direction runs obliquely to the general south to north direction of Lombok Strait, and the channel has a curved shape. Based on survey in 2009, there was about 1,419 hectares coral sites with 66 percent covered the sites in 3 meters depth and 74 percent covered the sites in 10 meters depth. Toyapakeh has a stretch of reefs, and in the southern part of the bay there is a similar area of rugged bommies, rich with color and fish. Big schools of fish, sea turtles, and occasionally "Mola mola" (sunfish) are highlight of Toyapakeh diving. Toyapakeh is special for its pillars of coral. Malibu Point is a diving site with gray reefs, reef white tips, silver-tips and numerous sharks. While Penida Bay is another anchorage, and the rocky islands have an interesting forms; something like an old resting elephant. The bay is vulnerable to swell, creating-up-and-down-currents. Then, Manta Point is a limestone rock off Pandan cafe. The swell is relatively strong. A bay frequented by tourist boats because it is a known location for spotting and swimming with Manta Rays. Crystal Bay is located on the west side of Nusa Penida. The bay is a popular tourist destination. The beach is jotted by lonely palm trees. One can rent umbrellas, chairs, snorkel gear, and light refreshments. Just outside the bay there is a big rock, a small island even, which can be used as a point of reference, especially under water. The snorkeling here is considered some of the best on the island due to the clarity of the water with eels, Napoleon fish, parrot fish, seasonal turtles, and brilliant coral. During the summer months Mola Mola are often spotted here although they can also be spotted during the wet season. All of this is easily accessible from shore, but caution should be taken if the current or waves are strong. There are many fast boats which are available in Sanur port, Serangan port and Padangbai port to go to Nusa Penida. Fast boats depart daily from Bali's mainland, Sanur, Serangan and Padang Bai harbour. Tickets can be bought at the fast boat offices or online. Most of the boat companies offer free hotel shuttle service from and to the main tourist areas in South Bali.