While I'm at it I'll map out a few of the other Don trails that I know of.

Lower Don Trail (aka, Speed trail)

Upper Don Trail (aka, Ridge trail)

I think some peeps call this Trail "Party Atmosphere", this one isn't super accurate because there are so many forks in the trail and I might have confused myself a bit. It's a good technical trail with a lot of switch-backs, the first part of the trail is a bit depressing because there are big piles of trash by the trail from the apartment complexes.

Here is a good warm up loop (Fruity Loops) in Taylor creek Park, not too technical and there are a couple of decent climbs.

Here's another short loop in Taylor creek park (Doctor Quads).

I've been on a bunch of other trails too but they're kind of hard to map out.