A cool mist lifts off the Río Balsa as guides collect guests from hotels around La Fortuna, their voices carrying the practiced cadence of safety briefings and local jokes. A 30‑minute drive threads past banana plantations and low hills, and then the river opens — green water that dares you forward, riffled by narrow chutes and the occasional ledge. Paddles dip; the raft bites into rapids with names like “Magnetic Rock” and “Dredges,” offering two hours of Class II–III runs that are lively without being extreme. Expect lively swells, playful holes and at least one big splash that will earn everyone a laugh.