The desert-dwellers of Nevada may not have been introduced to the concept of standing on a surf board and paddling your way across a lake. Which is to say that they may not know that it's calming, relaxing and the most fun I've ever had while getting a solid core and arm workout.
Hidden out at Lake Las Vegas, Paddle to the Core rents paddle boards (modified surf boards) and oars right by the lake. The owner (who was really nice) will take you down to the lake with the board and teach you how to maintain your balance while paddling along. You'll feel a little wobbly at first, but after awhile the movement and balance become natural and you'll cruise across the lake.
Our group had a great time paddling across the lake at sunset with the mountains glowing in the background. I'd recommend it to anyone looking for an in-town excursion.