Thanks for the info.

The problem of visiting the other islands is not the short field
capability of my plane(it being a Rallye), but my lack of German.
According my Bottlang Borkum is the only one with English R/T.

The plan is to have a vacation for a week or so in August(when the sea
temp. is a bit up) and use Borkum as a base to fly from to other nearby
fields in Germany or maybe Denmark.
To be honest, Helgoland is high on my wish list.

Happy landings,
Kees.