Past Lahaina, Kanapaali and Kapalua, west Maui takes on a rugged look. The coast gets rocky - don't look for many shoreline access points here! - and conditions invariably turn windy. At its northernmost point, Nakalele Point juts into the Pacific unprotected by Molokai, Lanai or any other island. High winds, crashing surf, and a hole in the lava rock create a blowhole. When conditions are right, each big wave forces water through the lava gap, sometimes shooting 30 feet into the air.
Take route 30 north from Lahaina. After Kapalua, it quickly changes to route 340. Go 1/2 mile past mile marker 38 and park on the left side of the road beside the round rocks. Be sure to lock up and remove valuables: from the broken glass on the ground, it appears break-ins are common.
You can watch the geyser-like show from close to the cars, but hike down closer. Be careful: observe where the ground is wet and which way the water is blowing. Most times you can safely get to the flat area around the blowhole for a saltwater shower! Feeling adventurous? Want to get away from those other people? Then climb around the desolate lava to the left of the blowhole to watch some more big wave action.