I am test driving a Leaf tomorrow morning. Any recommendations for what to do/test/pay attention to? It will be the first time I drive an EV of any kind (my wife too).
Normally, people look for potential problems or annoyances during test drives. However, unless you have special needs, the LEAF's drawbacks (range and such) don't show up in a brief test drive. Most people come away very impressed. Close the windows, turn off the radio, and see if you can hear any noise at 25-40 mph.
You might want to start with Eco and B mode off, then turn on ECO, and finally test the car in B mode. If you start out in ECO/B, the feel of the brakes may be surprising. It's also good to commence with ECO off to see how the LEAF can accelerate.
Finally, if it's a hot day and you notice that the dealer has charged the vehicle to nearly 100%, ask him to only charge to 80% in the future, unless necessary, as per Nissan's own recommendations for battery life.