One branch of Haleakala National Park runs down the mountain from the crater and reaches the sea here, where a basalt-lined stream cascades from one pool to the next. Some tour guides still call this area "Seven Sacred Pools," but in truth there are more than seven, and they've never been considered sacred. You can park here and walk to the lowest pools for a cool swim. The place gets crowded, though, since most people who drive the Hana Highway make this their last stop. If you enjoy hiking, go up the stream on the 2-mi hike to Waimoku Falls. The trail crosses a spectacular gorge, then turns into a boardwalk that takes you through an amazing bamboo forest. You can pitch a tent in the grassy campground down by the sea.