Slovenia for me. Was there last year for the first time since 2003.
Gorgeous - sun, miles of walking paths, mountains, good beer, friendly people and the village I stay in has a fabulous cyclepath going through it that takes you into Italy one way and south into other parts of Slovenia the other way. There's also a mountain bike park should I ever decide to risk breaking a few limbs or my neck give that a go. Likely to rent a bike a few times again this year and go for a few leisurely rides - not used to cycling in such high temperatures!