Arenal Tubing. Explore the mountain in a fun and very exciting way. This tour has three different activities that will provide you a good choice filled with emotions and sensations that satisfy the most adventurous tourists. The first activity you will do at Sky River Drift are 2 carbon fiber cables. After these the River Drift adventure will start, traveling on an exciting tour through the Piedras Negras River. Sky River Drift is a fast water path with controlled rapids travelled on individual rafts. The thrill of being carried by the current towards the rapids and the force of inertia that dominates the raft is a mixture in which any adventurer will be satisfied in their pursuit of adrenaline and fun.