At Cape Cod Canal, they do allow 1 person to do it. You open the rest room building by 8:30 a.m.
close it at sundown and give it a cleaning. Per the contract, you will check it 2ce during the day, or more if it needs it. (July 4, Memorial Day)
You use a Corps issued 'Gator' to do your job. You ride it ON the Canal service road, which everyone calls a 'bike path' .
We used to have to stay 'on property' during our days working in case an EMS needed to get through gate onto service road for any accident (bicyclist) or over heated/dehydrated person. Now, you can leave if you want. The Police/EMS have their own key.
Training is mid April and you are paid for the 3 days. April, May, June are very slow and very easy. July-Aug are busier, then Sept it winds down again.