Hi jjmb and a warm welcome from me too. First off, try and get hold of
@gordon hamlett 's book "Best Birdwatching Sites: Scottish Highlands". He's a member here too. There's a very good section covering that area :
Best Birdwatching Sites in the Scottish Highlands
Find any walk in the woodlands around the area, the Queens View should also give you some birds. I love the drive on the south side of the loch, stopping a every opportunity for a scan or listen.
Sorry, I can't help with Pine Marten though. Maybe ask the locals when you are in the area, they may have some information. Do try and fit in a run right out to Rannoch Station.
I'm sure you will enjoy it here and I look forward to hearing your news.