Reuse an old tree to make a log pathway in your garden. Good use of "yard" trees and other wood that can't be milled; works much better in climates without termites. Good drainage under the log rounds will make the path last longer.
Pallet deck with stone fire pit. Dig up a small mote area around the fire pit, put a tarp down, fill with sand and surround the area with rocks to prevent the sand from spilling over and to hold the tarp down. And easy deck idea in the back.