There will be moments during your cycling tour of Kilauea, one of the world’s most active volcanoes, when you’ll peddle past misty steam vents or marvel at fresh lava flows and think, “Am I really allowed to be here?” The answer is an enthusiastic, “Heck, yeah!” Hilo-based BikeVolcano.com offers half- and full-day guided tours of this terrestrial hotspot on the island of Hawaii. Biking through this spectacularly unstable land gives you easy access to vast black lava fields, the Thurston lava tube (set in a lush fern and moss grotto) and numerous craters, including Pauahi where a curtain of falling lava deposited rocks that crunch like glass under your feet. The company’s latest offering brings riders into Kilauea’s East Rift Zone where red-hot lava oozes into the sea. No guarantees it will do that tomorrow, though; volcanoes are dramatically, thrillingly unpredictable. (808-934-9199)