Hi Matt, welcome to the forum
Monymusk is nice and central and there is plenty of good water on the Monymusk beats, you will also be in a good position to explore Inverure, Kemnay, Alford and further upstream.
I would have a look round the pages within our website to get a feel for things, starting at the Don page
https://www.fishingthefly.co.uk/river-don.html. My preferred beats are more about the surroundings and scenery than the fishing, there are nice fish to be found throughout the Don.
You will find info about permits for fishing club beats on those pages ( these can be fished by visitors ) and for booking other beats throughout the river follow the link on that page to the Fishpal website
https://www.fishpal.com/Scotland/Don/.
The annual topics in this section of the forum are also worth a browse, for example 'River Don 2023'.
What type of fishing do you enjoy? Let us know and the forum members will hopefully come up with a few suggestions.
Best wishes
Mike