Not as touristic as Lake Bled, Lake Bohinj (Bohinjsko jezero) lies a bit further from it, accessible by train. It is also glacier lake, but more clean and peaceful. For cheaper accommodation check CŠOD Bohinj or start hiking to Komna hut and sleep there. Bohinj lake is a good starting point for other trails as well.
Find some hiking trails and other ideas of activities here: https://www.earthtrekkers.com/best-things-to-do-lake-bohinj-in-summer/
Other huts in Julian Alps: https://en.pzs.si/koce.php?reg=3
Foto: ivabalk, Pixabay