My all-time favorite (FS2k2 or FS9) is from Puntilla Lake (Rainy Pass Airport 6AK) through the Rainy Pass to Tatitna 8KA (Rohn Roadhouse). Do not fly above 4000' and use a plane which will maneuver below 120kias.
Set time to day/winterBill
If you want the route (you will never find it on your own) d/l this
FS9.PLN DISCLAIMER: USE AT OWN RISKP.S. the flightplan is just a notepad.PLN file and goes into your Flight Simulator Files folder
Using this VFR, FS9 Iditarod flightplan fly any segment of the trail you want. Just click the link and (S)ave (A)s. It will be good practice selecting the GPS500 LEG by FLT/CURSOR/ARROW DWN/MENU/ENTER/CLR