My guidebook lists North Supply Creek trail as just up the road from Grand Lake. Take 34N, then F.S. 491W (opposite Kawuneeche Visitor Center). Left on F.S. 492 shortly, then one more left in about a half mile. There should be a trailhead parking lot with info board just ahead. I haven't been there, but it's listed as "Moderate" (mid-level)--rough and rocky, but doable in a stock high-clearance 4WD SUV. They also list Stillwater Pass Rd. as a scenic, fairly easy route--it's south of Grand Lake, down 34, then right (W) on County Rd. 4. Lots of mountain views, ending at Hwy. 125. There's another one listed in the area, but it doesn't appear to connect to 34--Baker Pass, west of Ft. Collins and south of Gould. Best of luck, and have fun out there!