Find a spot somewhere under your car. Nobody's gonna get on their back and shimmy under there just to look around... just in case there might be a key stashed somewhere. Avoid the obvious places, of course...
the shop rite near my house sells these black magnetic jobs that you can put a spare key in. i got one of those, dropped my spare key in it & stuck it under my truck. it works really well & i don't have to ever worry about being locked out. i just have to remember where i placed the magnet! i try to move it around to a different spot each time i use the key, so that someone doesn't see my truck & be like, "oh, i know where the spare is, i'm gonna rip him off." i before i got that, i used to just throw my keys up under my bumper somewhere & leave it at that. worked fine. never had an issue at all.
in case my description wasn't good, here's a pic of what i'm talking about:
you may have gotten three keys: a big one that does all, a valet key that won't open trunk, and an all metal key that only opens the door (that's the one you can get wet). if you didn't get the last one, have an all metal dupe made of the valet key. it'll open the door.
meet a chick , knock her up, raise the brat, and when he/she is old enough, take em to the beach so they can watch yer sh!t while you surf. this also solves the "i'm too lazy/tired/fvcked up to get up and get another beer" problem
The only advice I can give is to check where you're hiding your key there is no hole the key can fall into. My friend used the gas door method and his key fell between the outer and inner quarter panel. Never saw the key again. Luckily he only lives 5 min from that spot. There are lots of holes everywhere under the car so check out your hiding spot before you try to hide your key. Magnet holders work well.
bike or walk to beach. remember the millions of barrels of spilling oil as you free yourself from your car. i live in philly, take the train to AC and ride my bike to various spots. keep my gear and boards at my friends place in ventnor.