Breamar – Aviemore is great done rding East to West via the Geldie and Feshie as the feshie section is the jewel of that ride. Glen Tilt is best done North to South, as the narrow section above the Gorge is sweet.
Lairig an Laoigh is really top notch riding but very remote. I would suggest best done North to South.
So in short ride from Aviemore via Glenmore round Bynack More to the Fords of Avon and Lairig Laoigh to Braemar.
Return via Linn of Dee, White Bridge, Geldie, Glen Feshie and don't forget to ride the bothy trail at grid ref NH 883 056.
This gives you a hard first day and a more mellow second.
First Photo is Lairig Laoigh, second Glen Feshie.