No, there aren't rules. But it can go from a nice walk in the woods to death trap out there fairly quick. The waypoints in the forest will also only link up with other waypoints in the forest. The only one that will bring you back to the city is in the Crossed Quills and that'll get you to Morningside Manor. Currency varies but cash at the least is accepted at the Quills. Some people will only take gold or silver or trades. I imagine it goes without saying but no one takes debit or credit cards. Make sure your phones are charged, only place to do so once you're out there is the Quills. Somehow you can still access the network though.