Istanbul (3 days) then Cappadocia (4 days). We just got back on Sunday – it was amazing! Felt as if we were properly ‘travelling’ but it’s not really that far away.
I would recommend the Travellers Cave Hotel in Goreme (the most awesome hotel I’ve ever stayed in – an actual cave house, beautifully restored with lovely staff and terrace gardens), Anatolian Balloons for the dawn balloon ride over the ‘fairy chimney’ landscape (worth the money, I promise), exploring the underground cities, make time to climb the mountains near Cappadocia (we didn’t – wish we had), and do a boat trip up the Bosphorous between Asia and Europe to the Black Sea.
It’ll be a bit hot in August for any mtb… we met a couple of mountain bikers in one of the Cappadocian valleys… they were pooped and it was only about 10am!
Here’s a link to the hotel I was on about: Travellers Cave