It was a lot of fun - a trip my son and I should remember fondly forever. No, not a bike or an RV...a minivan. I'd have preferred to take the car which gets better gas mileage, but all the stuff we had for a 4-week trip wouldn't fit. We managed to get the minivan into and out of some pretty remote areas (like where GC12 and GC17 are) unscathed, but there were a few places I'd have much rather had a 4WD.
We took 9 days to get from NC to Oregon, then spent a week there, which is when we went to the site of the very first geocache (called a "stash" then) and found GC12 (second oldest remaining) and GC17 (another of the very early caches). When we left Oregon, we spent 14 days making our way across the northern part of the country.
During the trip, we visited the Pacific Ocean (at Cape Lookout, OR which has a cache with spectacular views on a cliff 500' above the ocean!), the Atlantic Ocean (at Virginia Beach), 3 of the Great Lakes, plus the Badlands and Mt. Rushmore in SD, Tetons and Yellowstone in WY, Craters of the Moon in ID, the headwaters of the Missouri River in MT, and a bunch of other less famous, but still interesting places. We averaged about 300 miles a day, but still packed in a lot of things...with all the stops we made, a lot of our days took from about 9am to 10pm - about 4-5 hours driving and 8-9 hours of caching and sightseeing.
And, yes, many of those logs were entered at 11pm or midnight after we arrived at the motel and were pretty tired, but we got several nice notes from TB owners, so we know our efforts were appreciated and it was definitely worth it.