When you meet the first time, it is like a lottery ticket: the more you invest, the more you can win or loose.
In my opinion, traveling to another country for a first date is quite a risk.
If you met online and he invites you for a week end in another country or city, what he has in mind is clear.
Imagine that he arranges the accommodation, takes care of everything.
I am sure he might be a caring guy and you can probably trust him.
Now, for a first date, try a smaller step if possible: a drink, a casual encounter or an evening.
A whole week end is a lot at once.