Howdy Neighbor,
I thnk that you made an excellent choice for a hotel. I've stayed at Treasure Island (TI) and have visited it many times.
TI is a modern megaresort in a great location. It's not the fanciest resort on the strip and it's not one of the budget hotels either. With a great center strip location, there are several other exciting resorts in easy walking distance. TI has an excellent house show, Mystere, which is a Cirque du Soleil show. It also has a quickie outdoor show on pirate ships. You will find a wide variety of shows, dining options, shopping, gambling, people watching, and other forms of excitement in and around Treasure Island.
TI was originally designed with a pirate theme to cater to children. It has since tried to re-establish itself to cater to active adults.
The hotel is a pretty large 3 wing building with elevators in the center. A room with a view of the strip is highly reccomended, especially for first timers. A room fairly close to the elevators will save you a lot of walking.