By car
From Ljubljana take the A2 motorway north towards Jesenice, exit there for the main road to Kranjska Gora. Turn left through the centre then keep going out of the town and over the Vršič mountain pass (1611m). After about 30km you will see signs for Trenta, then for Bovec, just keep going along main road 206. From Trieste take the A4 north towards Udine, keep following Udine on the A23 north, then exit at Udine. Take the main road west from Udine toward Cividale Del Friuli, stay on this road all the way to Kobarid (Slovenia). Then turn left for Bovec at the far end of the town. If you don't have your transport, take a bus first to Ljubljana.

By train
Trains are quite tricky. The closest they get to Bovec is Most na Soči, approximately 40km to the south. From there you could take a taxi, but bear in mind the distance. Alternatively you could rent a bike from Tolmin (6km from Most na Soči) and cycle the rest of the way, if you’re feeling a little adventurous.