I built this from a kit a couple years ago....use it for all my day trips when there aren't multiple boats going. Paid for itself fast.
one thing to keep in mind, Colorado changed their laws on mopeds a couple years ago as far as registration/insurance (maybe licence?) etc. so it's a bit more of a pain now. Mopeds really aren't that cheap nor are older but great bikes like the Honda CT mentioned. Gotta have insurance, motorcycle license, reg, all that for anything over 50 cc's here. I cheaped out...not the greatest on really big hills but gets my fat ass up slowly but surely. Pavement or moderate hills it flies. bolted a bike rack looking garage hanger I found at Lowe's to the front of my trailer and off we go.