A swift ride up the river gorge. Try and get a seat on the RHS for better views but it’s only 20 mins and lots of tunnels so it doesn’t really matter. And be sure to get the river boat back down, it’s the best way back down. You don’t have to book in advance, just get the special direct bus from outside the train station, rock up and ride. Loved the whole thing - about 3 hours total round trip.