From PZ you'll only get 2hrs either side of high tide to launch. You'll also need a bucket full of £ coins to park the car and trailer for two days.
As mentioned yesterday, we tend to set off from Falmouth now. Money wise, there's not much in it as the extra fuel is offset by £45 parking at PZ. Mylor/ Falmouth is a far better facility with secure parking. The run from Fal to PZ is quite special also.