I love landscape photography and it is one of opportunity since I always carry a camera with me. Also on any trek to take wildlife pictures we are surrounded by opprotunity. Of course in certain case the landscape picture is the main target and to do so you need more preparation like a tripod, cable release, filters and a wide lens. You might also need to take a trail with all your gear in order to get to the picture site. Also some landscape pictures might be dependent on the specific light at a set moment of the day, so they require more planning.