The Isle of Wight, taking in the Needles, Soutampton and Portsmouth:
via Kingsclere, Chilbolton and Lymington, round the Needles, follow the south coast of the Isle of Wight around to Bembridge (now re-opened, with concrete strip). Have lunch at the pub next to the airfield (good value/fresh food), and walk down to the beach and along the cliff-top if you've time.
Return via Portsmouth, Haslemere (across the Devil's punchbowl) and Farnborough.
A great trip that takes in cities, sea, countryside and the beach!