In reply to Professor Bunsen:
Damn, half written a reply and it disappeared....
Not been in May yet, so can't help with the logistics, and not stayed / visited Kranjska Gora.
Around Bovec there certainly would be plenty for a week, there's also the Soča valley running down from there - pretty stunning.
Food wise, my lass is a veggie and it's not great tbh. A lot of pizza, salads etc. There does seem to be a slight improvement in the food scene, with the now being a 2 Michelin starred restaurant in Kobarid if you're feeling mega flush! https://guide.michelin.com/gb/en/gorizia/kobarid/restaurant/hisa-franko
The food scene is one thing that slightly lets down Slovenia, but the scenery and people make up for it.