I'll tell you what,I'm both for and against such things. It's been happening in various islands right now,when cruise ships full of Israeli tourists try to dock,some people rush to prevent them from getting on the island.
Now here's the thing...these are almost all commie and anarchist groups. They rush everywhere to show how pro-Palestinian they supposedly are. Of course,they're only trying to promote their leftist/anarchist/atheist agendas.
Why I said I'm both for and against such moves: On one hand,it's actually a small gesture to show the Israeli government "stop,people around the world are getting fed up with you". Also,Israeli civilians can wake up a bit and see that Netanyahu is destroying their foreign diplomacy.
On the other hand,these are just a few hundred leftist groups who always rush here and there to start a fuss. It's not really about Palestinians. They're nagging about capitalism,fascism,USA,rich people and NATO. The usual.
Also,there's a danger of incidents happening around the country. The other day a Syrian somewhere in Greece,cut an Israeli tourist's ear. This is bad. I don't care what you're opinion is on Jews or Israelis specifically,when someone comes to your country as a visitor,it's hospitality. And supposedly Pakistanis,Arabs,Turks,Afghanis,Iranians know about hospitality.