[Gogar]

Have you stayed in the hotel before?

If it's a network you have agreed to join before, it will automatically connect.

If you don't like this, then you can go to

system preferences>
Network>
WiFi>
Advanced>
preferred networks

and delete ones you don't want to automatically join.]

If you absolutely want it to ask you every time, un-click the "remember networks this computer has joined" checkbox and delete every network in the list.