Cross-Island Track is absolutely the most interesting trip in Rarotonga. You will go across the whole island from north to south through tropical jungle during this approximately three-to four-hour lasting walk. You can also get a little wet and sometimes go in foggy clouds. Anyway, with a bit of luck you will have nice view of the highest peaks of the island Te Manga (653 m asl) and Te Atukura (638 m asl) from the highest point of the trek. Definitely do not underestimate shoes as there are a lot of slippery, muddy and even quite steep passages. It is possible to walk the trek in the opposite direction (i.e. from south to north) too, but it is not recommended as there is a greater risk of losing your way.