Active volcanoes, shimmering waterfalls, snowcapped mountains, tropical rainforests, a glacial lake and miles upon miles of golden, black, white and even green-sand beaches occupy an area smaller than the state of Connecticut. Guided walking tours of the historic Kailua-Kona area make great daytime excursions, and there are plenty of recreational pursuits available, including snorkeling, scuba diving, horseback riding, kayaking, golfing and parasailing.