Lighting, water gardens, decorative concrete curbing, gutters, power washing. That's just a few I can think of. Look around and try to identify a need. Then you can figure out how to satisfy that need.
and along the dumpsters, cleaning parking lots as well. Sometimes they need someone to just come in early AM, and clean the lots. Using like a leaf blower, already have the equipment, or better yet, vacuum on your rider?