Now older and living in KY where I can grow all sorts of stuff, tomatos, peppers, watermelon, pumpkin, etc... Me and my wife are thinking about moving to Boise but I'm wondering about the gardening there.

Is running the sprinkler a lot a realistic option like it was for the lawn when I was there? Or maybe I could move to things that do better in that climate, I think people grow a lot of grapes there right?

You are also right that there are quite a few vineyards in the area. There are also a lot of fruit growers in the area. I grow many kinds of fruit and find it more rewarding than veggie gardening. The dry climate and abundant sunshine make fruit growing relatively easy, but you do have to water. The only things you can grow without water are sagebrush and tumbleweed...

The other obstacles that I should mention are the cold winters and late frosts. It got to -8 degrees at my place and killed a couple of my new grape vines (established vines were ok). The last frost this year was May 24 (it hit 33 degrees), so you have to be careful when you set out tender plants like tomatoes and peppers. Also, in some years, it can go from 50 degrees to 90 degrees very quickly making it difficult to grow cool weather crops.