Here are some Garmin GPS routes you might find interesting. If you end up using any of them I'd be interested to hear how they worked for you so please leave me some feedback.
This is the Red, White and Blue Tour we did in 2011. It starts in South Florida and ends up in Niagara Falls on the Canadian side. It visits a bunch of National Monuments and museums including Barber's. It also hits all the motorcycle specific roads I could find. The last day is spent dropping the bike off in Brockport, NY. It totals 5500 miles and took us nearly a month.
This is our yearly trek to Torrey, Utah beginning and ending in Huntington Beach, CA. It also includes the famous John Burr Trail out of Boulder. 1750 miles.