I’ve been to Las Vegas 3 times but never to the older part. I’ve been to the strip and also spent a lot of time driving around the area looking at houses (for fun, not seriously looking to buy) and seeing the local flora and fauna. If you have a chance in your rented car, take a drive up to Mount Charleston. Only a short ride off the strip but when you go to the top, you’ll find the lakes iced over. Very peaceful feeling and odd that it’s so close to the downtown. You can see from Mount Charleston where they did the nuclear testing in the 50’s, off in the distance.
On the strip, if you are into being daredevilish, go on the rides at the top of the Stratosphere Tower. They have some great rides. You don’t know the thrill until you’re on them.
On the strip, just appreciate the architecture and attention to detail of the casinos. Each one has an atmosphere of its own. I don’t gamble but I do appreciate Las Vegas for being so different from the area I live in. I have a relative that lives there and I think they get jaded because it’s really an adult playground. Everything is so new and nice and luxurious (at least on the strip it is, and the surrounding housing complexes). There are a lot of bad, seedy areas in the surrounding areas, as well.