@DORRAGER Sorry for the delay - haven’t had much flying time recently.
Here is a list of 10 suggested Race Locations! In order of epic-ness 
Please click each for a description and screenshot!
1. Bora Bora Island
(Nearest airport = Motu Mute NTTB)
Going around the closer to middle area, and up through the gap in the mountain.
Bonus points for integrating the huts from this mod on the course path 
Bora Bora Resorts, Over Water Huts - French Poynesia V1.01 » Microsoft Flight Simulator
2. Venice (Grand Canal), Italy
(Nearest airport = LIPZ or LIPV)
Following the course of the Grand Canal and taking in other key landmarks such as the San Marco Piazza tower (turn around it as switchback).
3. Marseille (Notre Dame de la Garde), France
(Nearest airport = LFMQ or LFMA)
Going through this crevice next to the POI!
4. Buochs, Switzerland
(Nearest airport = LSZC)
Maybe going around nearest part of the lake in foreground and to the far low peak in centre of screenshot, around that and back. Beautiful terrain in every direction here though!
5. Hawaii
(Nearest airport = Kaluapapa PHLU)
Diving down into some of these gorges. Also use the idea with the slightly bigger floating rings as waypoints (not on the ground).
There is also a similar but more naturally “curved” gorge near Waimea-Kohala airport (PHMU) on the East island.
In fact there are interesting dips like this all over all the Hawaiian islands!
6. Papua New Guinea
(Nearest airport = Kabwumi AYKB / KBM)
Track around this “natural bowl” by this airport in the east of PNG. Or really anything in PNG will be stunning!
7. Gold Coast, Australia
(Nearest airport = YBCG)
Weave through skyscrapers in the city. They are nicely spaced to not be too close - make a slalom between them looping around. Maybe out to Burleigh Head National Park as a turning point.
(problem is those buildings don’t have collision colliders it seems! Maybe you can add them?!)
8. Iceland Valleys
(Nearest airport = Ísafjörður BIIS)
Can be challenging light in most months. Not much sun! Beautiful valleys.
9. Rock of Gibraltar
(Nearest airport = Gibraltar LXGB)
Fly close to / over / around the rock. Could stretch out to over the town at the north or around the bay a bit (but not too far to be boring).
10. Monument Valley, Arizona, USA
(Nearest airport = UT25)
I see you already did a VERY LONG track here for the Orbx Fun With Friends, but I mean something shorter and just going tight slaloms around the pillars, but a bit higher up in the air with bigger “rings” to go through - not on the ground like the current one. Eagle Mesa as one end and taking in those close thin pillars, with some low sweeping switchbacks around rocks and pillars. Would need colliders too.
I have some more if you want 