hot spring facility for day-use bathing
A hot spring resort or bathhouse where visitors can bathe without staying overnight; often found near tourist spots or along highways.
We stopped at a day-use hot spring during our drive.
日帰り温泉 also refers to a hot spring for day trips, but 立ち寄り温泉 emphasizes a casual stopover rather than a planned day trip.
Compound of 立ち寄り (stop by, drop in) and 温泉 (hot spring).