Puerto Vallarta at $336 RT

With lower hotel prices, peak temps 15º cooler than Phoenix, and a rainy season that's a bit of a night owl, you'd be hard-pressed to find a better tropical vacation in the summertime than Puerto Vallarta. While the other popular beach spots are covered in storms and sargassum, PV stays pretty vibrant.

Even the name itself feels summery. Puerto Vallarta. Rolls off the tongue like an ice-cold, technicolor cocktail.

And if you can tear yourself away from the shore, check out the local botanical garden. You'll get to enjoy the fruits of those summer evening rains — and the flowers :-)