Karakol is a small town that punches well above its size for one reason: geography. It sits where the Tien Shan mountains meet Issyk-Kul lake, so almost everything worth doing here is either a short drive into a gorge or a walk through the town itself.
The wooden Holy Trinity Cathedral and the Dungan mosque (built without a single nail) are both walkable from the center, and the bazaar is worth an hour even if you're not buying anything. Our city tour covers all three in a half day if you'd rather not navigate it solo on arrival.
Jeti-Oguz Gorge is the single most-visited spot near town, and for good reason — the red rock formations, a waterfall walk, and (if you want it) a horseback ride through the valley. Altyn Arashan adds natural hot springs at the end of a rough 4x4 track. Both are doable as day trips or extended into an overnight yurt stay.
Issyk-Kul's south shore has its own draws — Skazka Canyon's red sandstone formations and the Barskoon waterfalls are the two most worthwhile stops, both reachable in a long day trip.
With 3+ days to spare, Song-Kul lake and the Tash-Rabat caravanserai (both in the Naryn region) and multi-day treks to Ala-Kul lake are the next tier up — genuinely remote, and worth the extra planning.