Generally, and if I'm understanding the question well, as a tourist you should be able to gamble, but I think the rules that apply are the ones of the countries the sites you play on belong to. I'm not very sure, though... but perhaps the casinos you wish to use have information on them somewhere about what gambling regulations they conform to and what nationalities they can allow to play.
In past I played online poker in many casinos. But I was not so lucky. My friend recommended me to check up the apnet.com/natcasino . This casino looks adorable because I got here many free bonuses and natcasino has profitable online poker rooms.