As mentioned before, your friends could check out the hip new bars and restaurants that have opened up along Fremont Street the last year or two. I like Insert Coin, a combo bar and 80's style video game arcade (some of the machine are even out of order like in the good old days!). The revamped Gold Spike is also pretty cool, with its oversized beds and bean bags chairs; community center-style games like foosball, board games, and table shuffleboard; and bar and grill. Truly hipster stuff.
The Toy Shack at the Neonopolis is always fun, if your friends like vintage toys or the History Channel.