These days it may be better to just have film overnighted to your motel since most of the local camera stores are now gone. Pictureline in Salt Lake City used to do this (they once offered to have film shipped directly from their distributor to my Moab motel if I recall correctly), although these days they only list Delta 100 and HP5+ in 4x5 on their web site.

Sounds like an awesome trip, have a great time!