Camp Tikihama was a summer camp that Shawn and Gus attended as children. It was first mentioned in the episode "Bounty Hunters!" when Shawn attempted to explain Dwayne Tancana's presence to Henry, calling Tancana an old camp counselor from Camp Tikihama, introducing him as "White Feather." (Henry soon saw through the deception and demanded that Shawn remove Tancana from his house.)
A year later, in "Tuesday the 17th," Shawn and Gus return to Camp Tikihama as a favor to Jason Cunningham, who attended the camp with them and had recently bought the camp, which had been closed since (presumably) the summer of 1989, when an employee of the camp fell into the swimming pool and was electrocuted.

The Lyrics of the Camp Tikihama song, sung by Tancana, and featured in "Tuesday the 17th," are as follows:

Camp Tikihama what you are,
Reaches near and reaches far,
From white capped mountains to crystal lakes,
sing out loud for Tiki sakes!

We are friends who bond over bright ember fires,
And to marshmellow dreams we will retire,
Camp Tikihama you're so true,
La-la-la-la-la and then love you,
La-la-la-la-la and then love you!

It should be noted that in the second line Tancana says "spreads out far" instead of "reaches far" when he sings it for Henry in "Bounty Hunters!"