Bodhbh
Guru
Barring 'somewhere else' you can always just drop the miles to compensate and pick a route which is interesting enough so no big days are needed to keep you occupied. Me and a mate did a loop round Exmoor last year, it was pretty hilly and neither of us were bike fit, but - lazy sods we are - we just did 20-30 miles a day and it was no bother. 20 miles a day around the Pembrokeshire coast?