Isalnd hopping across the southern islands of Denmark.
Quite simply amazing.
We did 3 weeks this summer with our children camping. Sometimes used the nature campsites: basic, sometimes water, sometimes toilet on beaches, at farms etc. Sometimes in posher full holiday style campsites.
Weather was warmer than UK and had 3 days of rain in 3 weeks.
Some small bike round in a day islands, some bigger. Hop on the train when you want. Have some days cycling around Copenhagen etc.
Fantastic micro breweries too. I had the best ale I ever tried there from Aero.
Going back this summer to go up North.