Guide’s hot springs, known locally as rèshuǐ gōu (热水沟), are a 15km-drive from town past some mightily impressive barren scenery. Here you can join the local Tibetans for a free outdoor bath. There are several guesthouses nearby where you can enter the pools for a fee of ¥20. Naked bathing is common.
Taxis can take you there and wait an hour or so before returning for ¥60.