What is the difference between an outdoor "room" and a garden? Well, in my humble opinion, Lol it is the addition of Decor pieces, furniture, artwork, or architectual elements. Don't get me wrong; gardens in and of themselves are beautiful, but sometimes adding some extra features you can help establish the sense of having specialized rooms like you have indoors. Think dining room, conversation areas, meditation spots, or hideaways to read and/or take a nap! By having different "rooms" within these outdoor areas it make the overall area seem larger since it creates a variety of destinations and interesting perspectives to look at from different places.
Whatever rooms or themes you to decide to design; you will definitely enjoy a new and refreshed environment to relax in.