I bought one of those $16-yard sticks filled with Pina Colada and an extra shot. The extra shots are $1 each so you can theoretically go crazy for not too much money.
After drinking almost the whole thing I got just the right amount of buzzed without a hangover the next day and no queasiness the night of. This is a good drink on a hot Vegas night, and a cool thing to carry around as you wander the Strip.