I recently stayed Downtown (right off Fremont Street) for a couple weeks (I was in town for work) and had a great time. I highly suggest heading down and checking out the Downtown Container Park. I suggest going around sundown if you want to see the 40 ft tall praying mantis shoot flames.

I also had a great time at the Mob Museum. I had initially planned on about 2 hours there....and instead was there for almost 4. It’s a great look at the history of the mob from the early roots in Prohibition to modern organized crime. It shows a lot of the mob beyond just the Sopranos. Though, if you are squeamish, I suggest maybe avoiding it...or at least the room where they have graphic pictures of people the mob made “disappear”.