What is the instrumental music piece that plays when Adam Sandler goes to his happy place in movie Gilmore?

The instrumental piece you're thinking of is actually not from the movie "Gilmore," but from "Happy Gilmore." It's called "The Happy Place" and was composed by Mark Mothersbaugh, who is known for his work on many Wes Anderson films.

The music is a quirky and memorable piece that perfectly captures the absurdity of Happy's "happy place," which involves him swinging a golf club and screaming "F*ck you, ball!"