Board your local boat (caique) from the old port of Santorini for a 15-minute trip up to Nea Kameni. En route, admire the volcanic shores with the peculiar shape formations of the black volcanic rocks and the white pumice. After disembarking, a steep and fast-paced 30-minute (3/4-mile) hike on rocky and gravel terrain takes you to the crater of the still active volcano. During your walk up an ascending path, you'll have the opportunity to observe the lava fragments and the volcanic rock formations. Once you've reached the crater you'll have time to relax and enjoy the view of Santorini Island and the amazing cliffs of the caldera. Then you start your descent back to the boat. Finally you'll sail towards the thermal springs of Palea Kameni, with its green sulfur warm waters and temperatures that reach 37° C (98° F). Here you'll have the opportunity to jump off the boat and swim to the springs (weather permitting). Note: The volcano's hiking area is a very steep lava field with loose rock and uneven terrain. There is no shade; we recommend that you wear appropriate sun protection and footwear. If you wish to swim, please bring your swimsuit, a towel and a change of clothes. The changing facilities on the boat are limited. You must be a strong swimmer as the waters are deep and the current is strong. There are no lifeguards on the boat or the island. The sulfur water may stain your clothes. The sea water is cold; however the springs are very warm. Tour participation is limited. Temperatures can reach extreme highs during summer months; we recommend that you drink a lot of water and use suitable sun protection. This tour ends at the tender pier and you have a choice of returning to your ship or purchasing a cable car ticket to get to Fira town.