Do you have to have reservations?

You can do a walk in, but reservations are definitely recommended

Yes

You can walk in, but during the summertime you're probably going to wait forever.

You may be lucky to do a walk in, but it is advised to have a reservation.

While reservations are strongly recommended, you may try to walk in. Also, you may have better luck dining at earlier or later times...think 5pm or 9pm.

They are highly recommended. We had a reservation and still had about 10 minute wait.