Grass pathway through the vegetable or flower garden and a twig arch on each end of the path. Remember to make it the same width as the mower. The twig arch would look great with a gate. Image from the Complete Kitchen Garden Book
If you don't want to work on making your entire yard a private paradise, take one corner and transform it into a secluded getaway.Here, for example, two pines make a hammock feel tucked away. Add post for a hammock!