Leaving the job site better than when we started is a given, IMO. I forget some people don't do this. If there are 'trails' from bucking a log in the grass, that can only be seen when your close to them, and disappear when viewed from far, I still blow them onto the grass. This goes a long way. blowing off sheds, doghouses, cars, home roofs, etc etc means a lot too. Even if the roof is absolutely destroyed and covered in moss and leaves!
Acting professional, and dressing alike goes a long way too. Doesn't mean you cant have fun. We routinely will have customers comment on how much of true professionals we are, and the next breath will be.......I thought it was absolutely hilarious to watch you guys as well, you really love your jobs and it shows. When that tree/limb/top/branch/log/etc was being pulled over by the guys, and one of them was blowing it over like a candle being blown out, and the others on the rope were jokingly hitting each other with the end like a wet towel......'
Customers LOVE to see people ENJOY what they do. This goes farther sometimes, especially on shite jobs, that all other facts of the job. Guys grabbing a piece and running it to the chipper, passing another guy at the same time smacking his to say hurry up your slacking, shows good spirits too, and the clients pick up on these things.
A good way to gauge a referral, is how many thank you letters your office receives.........