No - don't bring a gift. It's not customary, and you're really buying a gift for someone you don't know. This is a professional relationship between your child and the teacher. And it can put the teacher on the spot, forcing her to find a place to display gifts from kids (not all of whom will give something) and it makes it awkward. Kids shouldn't be taught to "buy" a teacher's affection or attention, and sometimes kids can get the wrong idea.
Usually there are gifts at the end of the year. Ideally the room parents will organize a collection so that all parents can participate and not have every family get stuck with a $20 or $25 gift PER CHILD. And the teacher winds up with 22 gifts she cannot use or display. But you'll cross that bridge when you come to it. You'll see a ton of questions about that on Mamapedia, and most everyone who is or has been a teacher will tell you it's just too much to deal with individual gifts over years of teaching!
Just go and have fun and meet the teacher and find the classroom and explore the fun stations and all the rest of the usual activities.