I had tried Pinkberry when it first opened on the Strip and really, really liked it. However, as of recently I've discovered another froyo place by my house and I have to say, I prefer the other one. Yes, Pinkberry tastes pretty fresh but I could taste some artificial flavors in it. The employees are super nice and will give you as many samples as you like. I always go for original tart, with some berries on top. It is a tad bit expensive though for such a little cup.
Either way, if you are on the Strip and are looking for something light and refreshing, sans alcohol, this is a good place to stop in for a treat.