Hi Jo: There are several things you can do. You can put bushes on 3 sides, leaving an opening for access, make a wooden fence with a gate on 1 side for access, or, put up plastic chicken wire and plant climbing vines on that. You don't need to do all the digging and cement work that is necessary for a big fence. As a matter of fact, you can get some cinder blocks with a single 4x4 hole in the center, paint it, put a 4x4 piece of wood in it, as high as you want your fence, make your fence panels, and gate, and attach them to the 4x4 and you're done.
Here area some sites that may help. Some are for air conditioners, but you can fence in anything:)
I like this one:)
Hello! They have faux rocks that can be purchased. The easiest most economical might be landscaping suitable for your planting zone.