The triggers are everywhere: a diver-down bumper sticker, the lobster tank at the seafood market, a faint whiff of a far-off sea. We can’t make the call fast enough to our go-to buddy or dive shop. Then the question becomes which site to target. That’s why we’ve put together this collection of the country’s best scuba diving — spots to visit this weekend or to add to the agenda the next time you’re in a new city with time on your hands. After all, if you’re like us, there’s nothing you’d rather be doing than diving.