You can only fish in the lakes if you have a license. You can fish in the sea without restrictions. You can not bring fishing equipment that isn't unopened (to prevent introduction of foreign diseases). Individual people own the different open lands, so you can't just go camping or hiking wherever you'd like. They use the land for their sheep. There's some (read: a lot) specific hiking routes you can hike on without restrictions, and some you have to pay for (the one in OP requires payment for upkeep since it's crazy popular). Hope that clears it up a little bit