Well, only one of the Toyotas in the family leaks noticeable amounts of
engine or driveline fluids, but two of them leak rainwater into the
trunk.  I solved this with new gaskets, a considerable amount of
Polyseamseal adhesive caulk, and, in the case of the more abused
example, partial removal of one of the drain plugs in the spare-tire
well to let it leak right on out again.

One of them also leaks oil into the combustion chamber and then out the
exhaust pipe in somewhat greater amounts than I really care for, but
only in around-town driving and not so much as to make visible smoke.

They're nice cars and we're all pretty sold on 'em, but I'd stop short
of any claims of perfection.  Admittedly, a lot of people around me
have paid a lot more without getting any closer to perfection, or even
*as* close...

Anyway, my suggestion for the original poster would be to figure out
what the fluid is and just where it's coming from; then we can advise
further.   If it's oil, and the PCV valve is working (i.e., you're not
forcing it out with crankcase pressure), and the bolts are snug down
there, try a high-miler motor oil in the engine and a piece of
cardboard where you park.

Going after a trivial leak in an otherwise sound engine can definitely
open Pandora's toolbox.  If it's power steering fluid (don't Hondas use
a special formula that looks somewhat like motor oil) or transmission
fluid, we need to look elsewhere for the answer.

Cheers,
--Joe