Well, small indeed, but not so small as you might suspect. The combined Waddensea isles of The Netherlands, Germany and Denmark have a land surface area of about 1100 km² (bigger than Andorra, Malta, LIechtenstein, Monaco and Vactican City combined), If you include sea area, it's about 10.000 km². Texel and Rømó are the 9th and 10th biggest islands in the Nordsea. You could add the infamous Helgoland too. There are so many possibilities. I am curious to find out what you will come up with.