If you like Orienteering as well as music, the Scottish Six Days event is based near Oban this year, 31st July for a week - check the link from Scottish Orienteering website,
For sunsets and scenery, the West Coast wins hands down.
Argyll and the Argyll Islands are fabulous and not to difficult to reach; scenery dramatic - mountains, glens, forests, lochs, reflections - - - the farther out Hebridean Islands take a little more planning but have amazing beaches and turquoise water.
(I am biased 'cos of where I live, also in an island bagging group!)

Everywhere has history and archaology - and the best thing about most of Scotland is the swathes of empty space between communities.

I have to say that the North, North West, North east, Borders are all great too - and I love the Central Belt, our towns and cities have a buzz about them - you need more than a lifetime to experience all this amazing wee country has to offer!