We are spending 3 nights in early May in Bled and are considering renting a car for a day to see the Julian Alps (Vrsic Pas, Soca River Valley, Bovec, Kobarid) and back to Bled. Although we are very experienced drivers in the United States, we have never driven in Europe. Are the roads in good condition and well marked? Is there a lot of traffic on these routes? Any thing in particular to watch out for? And most importantly, can you recommend a good car rental agency?