Once you've been out there a few times you'll just know where everything is. The first time can be a bit confusing. First time I was out there I got a bit disoriented coming out of Upper Loch Ness and at the southern end of East Meadow. Some people seem to have issues with finding Ridgeline though I never personally understood it.
After doing a few workdays out there driving in on the fire roads rather than just chaining trails together I think I have a better appreciation for how everything fits together.
What kind of rider are you?
If you like a technical and challenging rollercoaster there's lots of those in the trails in the NE of the park. Fast twisty singletrack, lots of that to the south. Some trails like East Meadow and Spur may be wide open with almost nothing in the way of technical features but they'll give you a workout instead as you fly down the big hill and grunt your way back up it. The west and northern trails are kind of a mixed bag, some twisty and tight but can still be navigated without a PhD in Handlebar geometry, a bit of the up and down but nothing really intimidating, and a bit of exposure on the ledges but you're never forced right to the edge.
There really is something for everyone. If I lived closer I'd bring my cyclocross bike out and just run it up and down East Meadow and Spur for a workout. But since it's a bit of a drive I just bring the mountain bike so I can ride everything.