Ever wonder what it might feel like sliding feet first over the Niagara Falls? At a height of 16ft the Papasee'a Sliding Rock on Samoa's sleepy, ramshackle island capital of Apia is hardly the same height, but even fearless thrill-seekers can't help but get a knot in their stomachs when they plunge over the falls into the deep-water jungle pools below. his natural water slide has been described as "part Water World, part Jungle Book", and the experience is best done with a group of friends who you can share the fun with. There are smaller natural rock slides on the same site, but once you've done the main plunge the rush will leave you on such a high that you'll just have to clamber right back to the top to do it again.