Whether you're just gazing at Wizard Island from the rim of Crater Lake, or visiting it by boat, it's definitely one of the most prominent features of this national park. The island is actually the top of a cinder cone and rises about 755ft above the surface of the lake.
On the island you can hang out and swim or hike up to the top of the cone and circle the rim (2.5 miles round-trip). The Fumarole Trail (1.4 miles roundtrip) leads around the coast along cool lava formations. You'll have to reserve in advance to get a boat shuttle here, only available in summer.