There are two different videos for “Island in the Sun”.
Version 1: Mexican wedding
This video was directed by Marcos Siega. It shows Weezer playing the song at a Mexican couple’s wedding reception and features all four band members. The groom in the video is played by actor/singer Tony Gracia. (wikipedia)
oFFICIAL ViDEO: Version 1
Version 2: Animals
This video was directed by Spike Jonze. It features Weezer playing with various wild animals on a supposedly remote hill. Only Brian Bell, Rivers Cuomo, and Pat Wilson appear in this video, as bassist Mikey Welsh had left the band shortly before shooting.
Jonze’s version was given much wider play on MTV, and as a result it became the much better-known version.
wEEZER ISLAND iN THE SUN (SPiKE JONZE VERSION): Version 2