Frozen Change!
One of the best jobs I ever had was when I rented an ice cream truck. When my friends wanted to go to the beach, I went with them. While they got sun burns, I got money, lots of it.
You see, when you have an ice cream truck you buy the ice cream wholesale and can sell it for.... well you can sell it for whatever people will pay. So all you need to do is find the hottest possible place where people with a lot of money hang out. Don't waste your time with kids. The real money is selling great ice cream to starving adults. They think paying $5 for a pop is not unreasonable.
Here's a secret. Visit senior citizen homes. Seniors love ice cream as much as anyone else. The stuff they serve in homes is usually terrible. The problem is, ice cream trucks never drive up to senior citizen homes. These guys never get the chance to eat a chocolate swirl or Italian ice. Just ring the bell and they will come running (not literally.) And they don't mind spending a few dollars for a quality product.
Another tip is to park near a busy highway during rush hour. If you are lucky, the traffic will become gridlocked and you will have a "captive audience." People stuck in traffic seem to love eating ice cream cones. I don't know why, they just do!
How about parking in the lot of the Department of Motor Vehicles? People know they are going to be waiting for a long time. People waiting always have time for ice cream. It also relieves the anxiety of waiting to see if you can get your license renewed or how much you will have to pay. Hey, compared to a new vehicle registration, a $5 cone is a real bargain!
