to dry clothes, - wring them out as much as you can, put them in your sleepinmg bag, get in and sleep with them, body heat will work - they will be dry by morning.
If its really cold climb in sleeping bag head first, keep your socks on.
to dry clothes put them under your top,jacket,jumper,cycle top - they will dry out with body heat.
carry everything in plastic bags. seal one as emergency cloths.
always carry a compass - maps are only 50% useful without hem.
take a wooly hat, when not cycling it will stop you cooling down to quickly
to dry towels hang them on your backpack fixed top and bottom.
normally I would say ditch underpants. but in cycling to keep your padded pants dry wear them, take 2 pairs one on , one drying. - same with socks.(normally I would say wear 2 pairs of socks, a thin inner pair and a thick outer pair, change inner pair daily - but hopefully you won,t be doing to much walking)
Avoid getting wet , time lost sheltering is time saved drying everything out.
Pin a towel to your inside layer against your skin on your back - under your back pack. - it will stop sweat getting into your back pack and outer clothes.
all little tricks learned from 10years of soldiering.
to plan your route go on ridewithgps.com - a good route planner