This gorge is a short distance from Bled and accessible either on foot, by local bus or in the summer months by tourist bus. We took the tourist bus, which is just 200 SIT each way. It's a nice run from outside the Grand Hotel Toplice as the bus runs around the lake and then up to the castle before going to the Gorge. Entrance to the gorge is about 500 SIT each.
The gorge itself is a wooden walkway that is built into the rock of the gorge and built rather amazingly in 1893. It's 1600m long and follows the Radovna River. The walkway crisscrosses the river several times giving great views of the falls and rapids. The walkway can get wet and slippery so good shoes are required. At each end of the walkway is a small snack bar and some picnic tables.
This is a superb place, if not for the rapids (which in summer aren't so spectacular), then for the walkway, which is pretty impressive.