nothing wrong on settling on one guy and having quasi boyfriend experience with him next trip. My advice though will be to have plan B as next trip you may find that he is not as hot as you thought at the first time or , even worse, he may be as hot as he was but you will notice he is not interested in you and tries to avoid your eyesight when you are in bar . And it's always possibility of him not being on the scene anymore. Take it from me , with quite a few trips there I went through all those options.
But if everything works as you wish, yes , I'd stick to known quality. Older I'm more and more I believe that's is the best course of action although not necessarily involves just one guy like Vessey said above .