2 Hours in Vegas sounds like enough to me.
According to their slogan, what happens in Vegas, stays there... and money is no exception. So in order to save some of our cash for the rest of the month long excursion, we decided to just get a first hand feel of the city, spend no more than a few dollars at the slots - just to say we did that - and then head out of sin city with our tails between our legs.
Parking was a pain to find, cause most people who go there stay there overnight, and thus have access to a hotel parking lot. We pretended to be a hotel patron, and parked in one of those for the two ours we spent there. There's literally no street parking, anywhere. No meters. No big public parking lots. So it's a search for a spot if you just want to have a quickie with the city.
Between the three of us, we only lost 15 dollars in the casinos. We played at the Bellagio and some other smaller and lesser known hotel that I can't think of the name and probably because it's smaller and lesser known. But walking around the city is easy, and there's plenty to see for free on your feet.
There's also a great deal of expensivish restaurants, but we managed to find a pizza/burger/bar with reasonable meals at reasonable prices near the end of the main drag.
Only one of the four of us wanted to stay longer but with the democracy that we declared in the car earlier, we moved on from that city quickly.
The closest camp site to Vegas, that is also on our route, is Lake Mead. For being heavily polluted and in the middle of a desert, it was a lovely lake with well placed campgrounds.
We set up camp, some faster than others, and then played cards, ate dinner, wrote in our journals and fell asleep to the soft sounds of the wind in the trees.
The next morning we were awoken to the sound of screaming birds at about 5:00 am.
Lake Mead: Las Vegas Bay $10 per vehichle
No showers, good views of the lake and valleys, lots of firewood in the area.
Note: Make sure you pay the fee at the campsite, and not at the exit 9 miles away where you have to make a u-turn and end up with an 18 mile mistake.