If he decided to play pro hockey in Amsterdam I'd be pretty concerned for the Islanders. Compared to other culturally-similar countries in their region the Netherlands is a hockey black hole- I've never understood it, and unlike Norway or Denmark it doesn't seem like there's even a spark there threatening to catch on. I was staying at a friend-of-a-friend's house in Rotterdam and sports came up, and I mentioned that the two sports I really cared about were hockey and football. She knew that as an American I meant American football and she had a basic knowledge of the game, but said that hockey wasn't very big there and she didn't even know the rules. This led to a pretty confused exchange until I realized that she thought I was talking about field hockey! Ice hockey is so unfamiliar to the Dutch that this girl assumed I was talking about field hockey, which is still only about as 'popular' as it is over here.
Amsterdam is a great city though, no reason he can't play somewhere in hockeyland where he can visit by train!