Where to go ? Love gardens, not fond of cold weather!

I will be in Buxton (north-central England - Peak District somewhat west of Manchester) and ready to leave it in early August 2006 for 6 days before flying back out of Manchester.

I can ride coaches, trains, or or rent a car (from the US).

Not a lot of $ to spend, and a dollar is worth about 1/2 of a pound (ouch!).

Any favorite "must see"s?

Should I go to Wales or Cornwall or save them for a longer trip or different time of year?

Previously I have been in London and south to the Isle of Wight,and on a different trip, across to Oxford (a favorite garden!) and to Bath. Once to Edinborough. Loved every place - what's not to love?!

Any suggestions for this 6 days would be greatly appreciated!

Irma