Víti is a stunning crater lake filled with turquoise water. The drive up takes you through a geothermal energy area, with steaming vents and colourful mineral deposits surrounding you. For the best views, take the easy-to-moderate hike around the entire rim of the crater, which should take you about an hour. When we were there you could not do the full crater loop. Be sure to dress in layers, as it can get incredibly windy up there.