I did a fair bit of the balkans pre-kids and loved Croatia, Montenegro etc. Have been wistfully googling and flights for 2 adults plus 2 kids (3 and 1) to Ljubljana in late spring are stupidly cheap.
Has anyone done Slovenia with small kids or at that time of year? Any recommendations? Lake Bled maybe, or the coast? Or am I just going a bit stir crazy in the house over Christmas?