Foča is the gateway to the Tara canyon. Put-ins around Šćepan Polje are why you're here. The town is a river base, not a spa stop. You'll raft bigger water than a late-summer park run on the Una, then maybe sleep and hike Sutjeska the next day if your arms still work.
Canyon rafting
Tara rafting is the product: canyon walls, cold water, and a grade that depends on melt. Multi-day trips exist. Day trips exist. Both are weather and level dependent. This is not a splash in a city fountain. Listen to the safety talk.
Pairing with the park
Foča plus Sutjeska is the east's natural combo. Open the Book here tab for put-ins in this region.