Hotel Stores - If you forget your sunblock please I beg of you use the Walgreens in the middle of the strip. A small bottle of sunblock inside the Hotels costs ten bucks. THe Walgreens is located center strip at 3765 Las Vegas Blvd. S, tel. 702/739-9645
Avoid the stratosphere roller coaster, it's a real joke. It's nice novelty to have a roller coaster at the top of the tower, but it's wimpy and expensive. The observation deck is cheaper and just as exciting.
The Las Vegas shows are outrageously expensive. Expect to pay $100+ to see Siegfried and Roy show or performers of a similar ilk (i.e. cheesy, slick, and ultimately boring) consider the large number of 2nd-tier shows that run every week. Lots of well known magicians, comedians and musicians are often to be found playing at smaller venues and much more reasonable prices. Failing that, consider amusing yourself with the free entertainment that most of the hotel/casinos put on near their gaming floors.