This museum is actually really neat and surprisingly well though out for being free. Sam loves looking at all of the animals and since they are all inanimate, he can get pretty close to them.
They have a ton of animals there including 2 giraffes, a huge elephant, zebras, lions, bears, fish, a hippo... ok, pretty much any animal you would want to see.
They also have a play place area that Sam really enjoys. It includes a slide and a tunnel. The opposite wall has a magnetic puzzle for older children.
I like that many of the animals are positioned in a "true to life" way. They depict many of the animals as if they were in the wild.
They also offer free live animal shows which could be a bunch of fun. We've never been to one of those so I can't comment on what they are like, but I bet they are great.
This free museum is definitely worth a trip. http://mlbean.byu.edu/