I'll echo what Prwlr said about the challenges of fly fishing from a driftboat for a beginner so don't hesitate to bring a spinning rod. If you want to learn how to fly fish, check out the fly fishing school put on by Madison River Fishing Company (MRFC.com) in Ennis, MT. I took this class in 2008 to improve my skills and it was great. A rafting trip on any of Montana's big scenic rivers (e.g. Blackfoot/ Clarks Fork/ Jefferson in the Missoula area) is a good option, or taking a boat/ canoe and fishing the Hebgen/ Quake lakes in a beautiful area south of Ennis is another option.
