Epping Forest is a 2,400 hectares area of ancient woodland between Epping in the north and Wanstead in the south, straddling the border between Greater London and Essex. I tend to get off at Loughton Tube Station (Central Line), which is about 10–12min walk to the forest.
This is one of the only platforms on the London Underground that is not bombarded with billboard advertising. It's a reminder to myself of how an uncluttered environment can give you so much more room to think.
This is an amazing place for the summer when the water gets pretty warm or the winter if you are very brave. The only downside is that it can get very crowded in the Mixed pool but the men’s pool is normally quiet and it has a diving board.