I'm a rando rider. Did the GA series last year plus Boston-Montreal-Boston. This year I'm planning to do Paris-Brest-Paris. At some point I'd also like to do the Rocky Mtn 1200.
Riding brevets and then BMB gave me a real sense of accomplishment. After all, after you've riden a couple dozen centuries, etc. where's the challenge? Rando riding strips away all the BS. You've got to know how to make your bike work (and keep working), how to make you body work (and even harder, keep working, how to deal with all weathers, night, and road conditions. It's 10% physical and 90% mental [toughness].
Then, it's just "Eat, Sleep, Ride, repeat."
Dave