expedition anyone?

....I've mentioned this to Tom H recently. We're both into the idea of a summer excusion somewhere in Wales, with the aim of walking somewhere pretty remote, camp overnight, have a nice evening in the wilderness, and note lichens on the way (take a GPS). Two suggestions are either some remote upland mountain saxicolous/terricolous stuff in Snowdonia, or perhaps get submerged in a wild woodland somewhere for a couple of days? It would be grand if any of the other apprentices would like to join us. I guess this would probably have to be a weekend, most likely in August/early Sept.