The Riddle Lake Trail is a 5-mile easy hike with an almost imperceptible elevation gain. The mostly flat and pleasant single-track dirt trail runs through grassy meadows and tall lodgepole pine forest and across the Continental Divide. Riddle Lake is a lovely blue backcountry lake with a small yet pleasant beach and fantastic views. Keep an eye out for wildlife, especially bears, which sometimes force the closure of the trail. Although easy, this trail is often almost deserted, so you have a good chance of enjoying it in solitude. The trailhead can be found south of the West Thumb on South Entrance Road, at an elevation of 8,000 feet.

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