Keep in mind that for some of the more popular restaurants that are in the hotels, like the California Grill and The Flying Fish, the locals also eat here on weekends, so it can be very hard to get in them. We were there this past weekend, and while we could get a table to 2 at most of the other places, California Grill was closed out weeks ahead of time. I had a PS, but was trying for an earlier time. I had called about 5 weeks ahead of time and still could only get 8:45 pm for our orginal PS. There wasn't anything available on any of our night for 5, so if I had wanted to bring my kids, would have been out of luck.
I still say, if there is some place that you really want to try, make PS for here, otherwise you may end up disappointed.