In reply to Ciderslider:
From you in the Swanage direction there is not a lot except Swanage! What have you done in Devon?
Hay Tor (and Low Man) are well worth a visit and is about 2¼ hrs from Swanage, so perhaps 1¾ hrs extra for you (non Bank holiday times!). Hound Tor is just down the road from Haytor and is well worth the visit; the routes are not long but very varied.
The Dewerstone is really good, and a lovely spot, but is on the far side of the moor and takes a fair while extra to get to; but is worth it.
Other than that there is the Torbay limestone; but if you want a rest from the excitement of Swanage perhaps not ideal.
Other than those the Wye Valley has much to offer and is easy to get to. I had a cracking day at Wyndecliffe recently. lots to do at your grades.
You could of course have a "Swanage lite" weekend. Places like Slippery Ledge, Seacombe and St Aldhelm's Head don't have the grip factor of the bigger cliffs, or the crowds of Subluminal.