My dad was in the tree trimming business and he always swore that it was the best kind of work that a person could do. He was not being sentimental, he was being practical. According to his logic, there are trees everywhere and they need to be maintained no matter how good or bad the economy is. They need maintenance whether the weather has been good or bad and they are a public symbol that everyone supports. If steady work is what you are looking for, tree trimming might be the ticket.