If any Chiang Mai nature stay earns the top score in this article, plenty of reviews give it to Onsen @ Moncham — a Japanese-style ryokan up on the hills of Pong Yaeng sub-district, Mae Rim, near the Mon Cham viewpoint, at around 1,200 metres, where the air runs noticeably cooler than in town, sometimes by ten degrees. What sets it apart from the usual Japanese-style stay is that the onsen is genuine natural mineral water from the Pong Yaeng hot spring — the resort says it's rich in copper, magnesium and calcium, not a heated tub — with both communal baths and private in-room baths for rooms that list them. Real reviews talk about the onsen water in very positive terms; many say it helped their muscles unwind after a full day out, and one international review even called the place "the best of Japanese style in Thailand." All 24 rooms go deep on real ryokan detail, many laid with tatami mats and Japanese futons that a lot of guests found more comfortable to sleep on than expected. Another thing reviews praise again and again is the breakfast, which many rate as genuinely five-star, plus the warm service from a small team that looks after everyone closely because there are only 24 rooms. Honest caveats from the reviews: it's up on the hills, far from town, so you should budget nearly an hour each way; the winding road gets slippery in the rainy season with heavy fog; dining options outside the resort are few, so you'll mostly rely on the resort kitchen; and the in-room onsen baths come only with certain room types, so pick the right room name. This is the best-value pick for couples and for anyone who wants a slower-paced getaway, a soak in the onsen with a mountain view, and a resort that's the destination of the trip in itself.
- ✓ Genuine natural mineral onsen from the Pong Yaeng source, scoring 9.6 — the highest in this article
- ✓ Detailed Japanese atmosphere, tatami rooms, comfortable futons
- ✓ Cool air at 1,200 metres up, full Mae Rim mountain views
- ✓ Warm service from a small team, attentive because there are only 24 rooms
- ✗ Up on the hills, far from town — budget about an hour each way
- ✗ Few dining options outside the resort, so you rely on the resort kitchen
- ✗ In-room onsen baths only come with certain room types — pick the right room name