Left alone
It is nice to have the field to yourself, BUT....
A couple of years ago a good buddy was at the field, didn't have his plane restrained and accidentally bumped the throttle to wide open.
When all was said and done, he had managed to cut about 3/4 of the way through one finger tip and 1/2 way through a second fingertip. In about 2 more minutes he was in a state of shock.
If several of us hadn't been out there flying with him, there is no telling what would have happened to him. There is no way he would have been able to drive himself to the emergency room.
Needless to say, I haven't flown by myself at the field since then - it was just too graphic an example of what can happen in a split second.