The fantastic Dunwich Dynamo 2010 was surely a candidate for the best ever.
Tailwinds all the way, warm dry T-shirt weather even in the depth of night - and the buzz of being part of something huge, spontaneous and still unspoiled. Over 1,400 cyclists, the most ever, doing a 120 mile bike ride. Not for charity, not for competition, but for sheer fun.
I've just got back and I'll put up a more detailed report tomorrow. But right now I think I need a bath.