The Las Vegas Hilton isn't on the strip, I don't think. There is the Flamingo Hilton that is right there on the strip. I believe the Hilton Vacation Club is directly behind the Flamingo. We did stay at the HVC a couple of times, with a friend of mine. They have a time share condo. It's really nice.
We went on a river rafting tour...it sounds scarry, but it isn't. It goes through an area of the river that is very very mild. This is not a white water rafting tour where you would go through strong currents. There were about 20 people on this large river raft, and a tour guide. It was a 4-hour trip, and it starts right there close to the base of the Hoover Dam. You can literally look up and see the dam, and it is huge. I can't remember the name of the tour, but it was pretty much an all-day event, by the time you go on the bus, to another location where you get checked-in, and get your lunch, and then go on another bus to the launch site, etc. It was really a great tour. If I can find the name of it, I'll PM it to you.
I think Aladdin has the best buffet of any place on the strip. It's not cheap, but it's reallllllly good! We also like going through the M&M store. Walking through the mall at Ceasar's Palace is fun too, and the erupting volcano at the Mirage.