Maui Canyon Adventures. If the idea of exploring canyons by hiking, climbing, swimming, and rappelling appeals to you, this company stands ready, willing, and able to accommodate. Their friendly, knowledgeable guides encourage and assist you literally every step of the way. You must be at least 10 years old to participate and have a waist size no larger than 54 inches. Rappelling is a fairly strenuous activity, so be prepared for a workout. The tour price of $150 includes all gear, lunch, bottled water, mosquito repellent, and transportation to and from the site from their pickup point in Kahului. Observers may pay a lesser fee ($100) to do all but the rappelling. You can expect to walk over rugged muddy terrain, so be sure to dress accordingly. 808/270-1500. www.mauicanyons.com.