My personal recommendation is Rehai. Reason: Don't you go to Teng to brew hot springs? Rehai scenic spot is well planned, and there are many geothermal hot springs worth seeing. Dagunguo Scenic Resort's scenic spots are even more famous in the world. Beauty pool, bath valley and health pavilion are all good places to take a bath with unique flavor, and you can also taste geothermal food, which is really worth a visit.
Price comparison: a penny for a penny, Rehai is indeed much more expensive than a volcano, but it is worth it!
The best itinerary for a day: It takes about 40 minutes to leave for the volcano at 8: 00 a.m., and it takes 3 hours to see the volcano group and Heiyu River. It is suggested to climb Kong Xiao, where the scenery is beautiful and the journey is short. Dakong Mountain is really difficult to climb. Go back to the county for dinner around 12. You can watch 1 (Dieshui River, National Memorial Cemetery) and 2 (Heshun) 2 hours after dinner. Watch the hot spots for an hour, take photos and taste geothermal food. Eat some geothermal food and take a bath. After taking a bath for 3 or 4 hours, go back to the hotel to rest. You can eat in the bathroom.