Besides being in the Temecula wine country, you are in the heart of the Indian gaming area too
As mentioned Pechanga is in Temecula, but I agree, we like Pala is better it's just a bit south on the 15 to the 76, going east. If you follow the 76 east you will also find Pauma, a smaller casino still in a tent, and then down the road abit there is the Harrah's Rincon (a good choice if you have a Harrah's slot card) and then up from there even a bit more you have Valley View, another smaller casino.
Lots of choices, not quite like Vegas, but at least if you get tired of one, you can head down the road a bit to another one.
Have fun & Good Luck!
Rick