flight + invisibility is REALLY great. the invis looses it's charm once you hit the higher levels where everything, it's mom and it's limping dog have see invis/smell/blindsight/etc... but until then, it's REALLY convenient to do a dungeon bypass whenever possible.

but on water?

step 1: cloak of the manta ray

step 2: feather token, anchor

step 3: eldrich spear

step 4: laugh.

because nothing says fun like a torpedo sub!

SPOILER FOR SAVAGE TIDE ADVENTURE PATH
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i did this very thing for the "protect the village from the pirates" section of the AP. we moored them right at the entrance of the cove and within range of our ballistas then add a flying warlock+wands of fireball.

fun times when the pirates had to take the canoes into shore... and i was dropping fireballs from above.