Ašores are Portuguese islands so the customs are exactly the same as in any EC country. They are quite laid back about it and all yachtmen are very well welcomed. Don't forget to go to Peter's for a drink or to try the Pico wine and the cheese from S.Jorge and from Terceira, specially if you like it spicy.
The Islands are very beautiful in a savage way and the Ašoreanos are very nice people. Enjoy the stay and keep us posted
You have some information here:
azores - a├žores - azoren web portal