Give the neighbors something to ooh and ah over. Plant wildflowers that are bright and beautiful. Even lawn lovers can appreciate colorful flowers. Use landscape borders. Use rocks, landscape timbers, railroad ties, or whatever is available to make borders and beds.
Borders give the appearance of the area having received a gardener's attention.
Another aspect of giving the yard a boundary will be a fence. A rustic wooden fence is very natural looking yet gives a boundary that is easy to identify with. A bench in the center of the butterfly garden gives it a homey and much used look. Don't forget ornaments. A sun dial is always nice to look at.