Kilmartin is an absolute must, so much history so close together and so much written about the place, and you will definitely not regret it, however, if you want an adventure, remote sites, steep climbs up to hill forts, amazing stone circles, cairns and standing stones, then Aberdeenshire is the place to go, especially if you have a week to plan out. Beware, you will leave something behind and a longing to go back, the Welsh have a word 'Hiraeth' and it sums up how I feel every time I leave to head back home.