The classic London day trip is the triple: Windsor Castle, Stonehenge and Bath on one 11-hour coach day with admission included (from $75), or Windsor, Stonehenge and Oxford for the university instead of the Roman Baths. If you only want one place, Stonehenge and Bath together (from $74) give more time at each, and the inner-circle access tours enter the stone ring itself before or after public hours. The Cotswolds are a different day: honey-stone villages like Bibury, Bourton-on-the-Water and Stow-on-the-Wold on a small-group tour (from $94), often with Blenheim Palace or Oxford. Windsor alone is a half day (from $46). All leave central London between 7 and 8:30 am; book the Stonehenge and Harry Potter tours a couple of weeks ahead in summer.
200 tours · prices per person, book with partner