@Keto, the Wi-Fi part is easy - you just go into Settings->Network->Set up connection->Wireless and pretty much follow the prompts. You'll need to know the name of their network (which should be among those listed) and their Wi-Fi password. When you return home, just do the same thing. Your home Wi-Fi password should be saved (automatically filled in) when you select your home network.
For the local channels question, that depends on how you're receiving them now. All the apps installed on your stick will still be there, but depending on which one you're using to get your local channels there may be regional restrictions that will prevent you from getting them.
Make sure you bring the Roku remote for your stick (along with its USB cable) if you've been using the mobile app as a remote. You won't be able to change the Wi-Fi network (easily) without a working Roku remote that's paired to the stick.
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