This is the Northern Caiman Lizard (Dracaena guianensis) A long, powerful tail helps the Caiman Lizard to swim and dive while a clear third eyelid acts like a pair of swim goggles underwater. They're fairly large, growing to around 4 ft in length and reaching an average weight of 10 lbs.
“Self-acceptance comes from meeting life's challenges vigorously. Don't numb yourself to your trials and difficulties, nor build mental walls to exclude pain from your life. You will find peace not by trying to escape your problems, but by confronting them courageously. You will find peace not in denial, but in victory.” ~ Swami Sivananda