Meet sound weird but keep your weight under control. 75kg pilot can take a lot more payload
Like someone said earlier, be ready to go 10-15mins before hand. Act friendly even though it may be your 4th scenic for the day so that the pax feel special. It may mean repeat business or a kind word about you to your boss.
Also get familar with using digital cameras and taking a good shot. Always get a few request to take a shot of the group in front of the aircraft.