Great tips so far

We do most of the above! I bring my own snorkel, mask (prescription), Leatherman tool and several pool noodles

delicate subject alert. Clogged heads are no fun

/ We also have a Baggie placed under the sink for used tp

Since implementing this practice I have never had to force a guest to unclog a head. <img src="http://www.traveltalkonline.com/forums/images/graemlins/jester.gif" alt="" />

Otherwise I would only echo

Sailors should have intentions, not plans
You go with the flow and do what the weather allows