While we enjoyed the glass bottomed boat tour - they are both worth doing - THIS was the way to see the incredible bounty of fish around the island. Clear views under the water on all sides, knowledgeable guides, huge amount of marine life. Oddly enough, my favorite moment was the journey back, where we stood topside for a beautifully paced cruise into the glittering waters of the harbor. Aaah... life is beautiful. And my 79-year-old mother with two artificial hips did fine getting on and off and had a wonderful time too!