If you like seaside then Hastings is good - beach, new gallery, funicular going up the cliff top to some nice grassland if you fancy a walk, few interesting shops, fish and chips, amusement park if that's your bag, and can get there by car in about 1.5 hours from ED, less if you're lucky. Straight out through Bromley then A21 all the way, except for a couple of miles where it turns into the M25!