The first, was:
No Doubt
Goo Goo Dolls
Bush
I was a freshman in high school, and really into the grunge stuff, so Bush was awesome. Goo Goo Dolls were still kind of a "hard rock band", and "I'm just a Girl" had just started blowing up, and No Doubt opened.
Pretty fun for a 14 year old.
And it's kind of funny how the popularity of the bands flipped...Bush, who was the headliner, is completely irrelevant, and there aren't many stars bigger than Gwen Stefani (Holla Back Girl (

)).