If you're planning to tour in the summer months, a lightweight (~1 lb.) 50F rated bag will generally be fine. Pack a few thermal layers (and a hat!) in case it gets a little colder and you should be fine. Likewise, in warm weather one of the "pool float" type pads works well. They're thick and comfortable, yet light. Unfortunately, I've found these pads don't work well in colder weather.
http://www.campmor.com/outdoor/gear/Product___27345

Best of luck.