Hi Chris
This is a device for better WLAN coverage. See here https://www.tp-link.com/ch... if you connect the TP-Link to your notebook, for example, you should have a better connection to the camping site network - but of course you need access to it. So yes and no, you can use it to boost your WLAN signal, but you need access to the public WLAN - you don't have to access the router directly - or am I misunderstanding you?

Greetings
Oli