Lucky you - one of my favourite areas in Scotland and we go up pretty much every year when visiting the folks. I think whilst there are specific places (already mentioned) the best thing would be to don yer walking boots and head into the hills. Plenty of wildlife to see whilst out walking.
Loch Insh is just around the corner so I'd head there. It has an rspb site - Insh marshes. The nearby osprey centre mean the Boat of Garten is good too.
Maybe take a drive (and park and go for a walk) north to Grantown on Spey, turn off and take the Tomintoul to Corgarff road - spectacular scenery and goes up high past the lecht ski centre.
Head North to the north side of Inverness (40-60 mins) to Cromarty for a spot of dolphin watching.
I'd also recommend drives up Glen Affrick, and another past Glen Garry.
Loch Ness - look out for Nessie
Finally, head to the Aviemore ski centre, and take the mountain railway to the top - beautiful views when not shrouded in rain/mist!
You'll certainly see lots in the two weeks there.
And I've never had a bad meal in the Boat Hotel, (Boat of Garten). Try eating in the bar - very good food!
Mark