Do you already own the Netgear device, or are you still contemplating the purchase? If you have one, what model?
There are plenty of enhanced wifi devices besides that one, and you may just need a more powerful wifi receiver/antenna if all you want to do is have better wifi on a laptop PC. In most cases your devices are receiving the park wifi OK, but don't have the broadcast power to talk back to the park's base station. However, it is sometimes the case that the wifi is working just fine and the problem is congestion and/or lack of sufficient internet access capacity at the parks server. No extender can help that.
Basically an extender is just a fairly powerful radio that receives the park wifi signal and re-broadcasts it locally. You configure it to connect to the wifi signal you want to use and it does the rest.