Beach (but not nostalgic), hip (but not kinky), maybe something with aspects of the traditional Owl Logo (or not) interacting with a "surfboard like" component.
with tag phrase "CELEBRATING for 30 YEARS"
Maybe the "for" could be in a script, or at a slant. Kind of says it's been a party for 30 Years. Lots of variations (spinoffs) we could go with.