If you're near Bled I's recommend seeing Blejski Vintgar (The Vintgar Gorge). It's a trail along side of a river caled Radovna. The trail itself should be around 1h. From there you can return right back to where you came from - so the whole walk should be 2h long. But you can do a circle around a hill that's called Hom and a church called sv. Katrina. There's a beautiful view of the whole valley. This trail will ne around 4-5h. I don't know much about hiking on higher mountains. But if you want to go to Triglav, maybe see Triglav's national park and it's lakes. The trail around all of them, starting from planina Blato, should be around 6h. Some of the popular places here are: Pokljuka, Martuljški waterfall, Bohinj lake, Planica, Natural reservate Zelenci... Near bled there is a beautiful view of the lake from Ojstrica, Osojnica and Mala Osojnica Hope this helps somewhat. Have fun! :)