It would be much easier to give you some ideas if we knew your age, what you enjoy doing etc. There is way to much to do and see on one visit. It took us several visits to just see and do the basics. Make sure to watch the Bellagio Fountains, they are a free show on the strip. There are 100's of shows. I would just do some research and pick one or two for my first visit. One of the CDS shows would be great - "LOVE" is my favorite. Also, "Mamma Mia" is playing there yet at Mandalay Bay. It's a wonderful show too. Just walking down the strip and visiting all of the properties takes a few days and is a lot of fun. Don't over plan and just do a few things your first trip, as I am sure you will be back.