There used to be a Gold's Gym in North Las Vegas that I used to go to but it seems that closed some time ago. From what I can see, a really good gym is City Athletic Club on Sahara Ave. Not sure where you are staying but Vegas doesn't have insane traffic so you should be able to get there without a problem. Also, if you booked a room on the strip, request the highest floor available with a strip view (make sure to ask if it will cost more, but Vegas at night is pretty awesome if your room is on a high floor.)
If you want to party it up in the sun, I HIGHLY recommend Rehab at the Hard Rock Hotel and Casino, you can buy your tickets online. Here is a glimpse of the douchery and debauchery. I think the Hard Rock and the Palms Hotel have the best overall vibe for young people, really fun atmosphere but still classy. Some nightclubs that I think are good are Rain, Moon, and Tao. Here is a link to give you some ideas.
Any manscaping needs can be tended to at Box Human Landscapers, prices and reviews are very good, check out http://www.bikiniwaxing.com/
Best titty bar - Spearmint Rhino
Places to eat - my favorite breakfast place is Babystacks Cafe, there are 3 different locations. They do have some healthy options, but this is not a physique friendly place as far as their food goes, but it is the bomb. Best Indian food I have ever had is at Mint Indian Bistro, these people are fresh off the boat if you know what I mean. I also really liked the sushi at Yama Sushi, 1350 E Flamingo Road. You can find a great burger at Stripburger, 3200 South Las Vegas Blvd. For authentic Thai food, I would recommend Lotus of Siam, 953 East Sahara Ave. Just so you know, I like good food more than a purdy ambiance. Some of these places might not be the fanciest, but the food will knock you off your feet.