New comers to Las Vegas often wonders what activities are available. Many families come to the valley and seek family-friendly recreation. There are a ton of options.
One of my personal favorites is the Shark Reef at Mandalay Bay Casino Resort. For a minimal entrance fee explorers can see some of the most amazing fish including piranahs, pacu, salt water fish, jelly fish, etc. The favorites exhibits are usually the sharks (of course) and the sting ray petting pool.
If you are considering relocation to Las Vegas (ask for a relocation package) I would highly recommend a visit to the Shark Reef.