Basically, you need to setup configuration of the R36 router/repeater. Here are the
step-by-step instructions from Alfa. I'll admit, Alfa could have done a better job of making it user friendly. A more intuitive setup wizard would have been helpful. Yet not out of line for manually configuring most routers.
You already have the capability to share WiFi with other devices using Ad-Hoc ICS or Hosted Networks(command prompt) built into Windows, by just plugging the Alfa adapter directly into your computer. Generally, takes a few clicks to setup, but only good for your current session - you'll have to do this each time you disconnect from the park's WiFi.
Or you can use a free app such as
WiFi HotSpot Creator or
Virtual Router, which are similar to Connectify. Both will allow you easily setup and share WiFi with your other devices using your computer. The park's WiFi just sees one device from you, though you can have as many as supported on your end.