If I was taking a days trout fishing on the Don, I would take a ticket for Parkhill which is part of the Aberdeen and district angling club.
I would concentrate on the section from the old railway bridge up for about a mile.
Having fished the Don from top to bottom for a lot of years, in my opinion,this is the most reliable and consistent with regard to flies hatching and trout rising. There are also some very big trout in Parkhill, I had three over 5lb last year, and they should still be there to be caught this year.
Here is a link to the ADAA site on the visitors ticket section.
http://www.adaa.org.uk/fishingTickets.php.
I will be out of town that day, but if you do decide to try it out, let me know and I will ask my dad to show you around. He has fished the beat for over 50 years.