Ha'ena State Park on Kauai's north shore is one of the most beautiful and culturally important places on the island. Ke'e Beach sits at the end of the road, backed by green cliffs and framed by a reef that makes it a favorite spot for swimming and snorkeling when conditions are calm. The park is also the trailhead for the Kalalau Trail, which follows the dramatic Na Pali Coast. Limahuli Stream and the surrounding valley add to the scenery, and the area is rich in Hawaiian history and tradition. Advance reservations are required, and the fee is $5 per person plus $10 for vehicle parking. Book early, since spots fill quickly, and check ocean conditions before entering the water.