For family and scenery, your kit lens will work pretty well. However, I prefer an external flash over a pop up flash. I like something fairly wide for character meals, so I don't have to back up into someone else's table to compose my shot.
For AK, you'll likely want something with more zoom than most kit lenses offer. Likewise, you might want the same for shows and parades.
For dark rides, you'll want a "fast lens", something with a wide aperture like 1.4 or 1.8.
If you want to try shooting fireworks, you'll want to bring a tripod.
Most will bring a variety of lenses, but only pack a couple each day. And most who bring a tripod will store it in a locker until evening when they want to use it.