I believe the correct track to play is "215 Miles".
Seriously though, probably any of the tracks from the
Dark & Long EP would be great choices. Some other good ones might be "Spikee", "Dogman Go Woof", "Dirty", "Eclipse", and "Bigmouth" (yes, I went for all the long tracks).
On a related note, my co-worker tells me that "Ansum" and "Peach Tree" are great songs for swimming in the ocean.