Chena Hot Springs Resort has been a Fairbanks favorite for generations, since they first opened for business in 1911. The central attraction is the thermal spring, which puts out a steady flow of mineral rich water, naturally heated to a steamy 106 degrees Fahrenheit (41 C). The property has been developed into a full service resort with guest rooms, a campground, restaurant, geothermal energy exhibits, and more. The hot springs, which were discovered by brothers Robert and Thomas Swan in 1905, are fed into a 'rock lake' outdoor pool (adults only), as well as an indoor pool, with slightly cooler water, for families with children.
If you go:
Take the Steese Highway north from Fairbanks to the Chena Hot Springs Road exit (which comes up quickly, at Mile 2.6). From the turnoff, it's another 56.5 miles to Chena Hot Springs. The thermal pools and other attractions are available to day trippers and campers, as well as to hotel guests. A warning for campers: this is Alaska. There are bears in the woods.
Links:

Chena Hot Springs Resort
17600 Chena Hot Springs Rd
Fairbanks, Alaska 99712 USA
frontdesk@chenahotsprings.com
Mailing address:
Chena Hot Springs Resort
P.O. Box 58740
Fairbanks, AK 99711 USA
Phone Numbers:
Chena Hot Springs Resort
+1 (907) 451-8104
+1 (907) 451-8104