kpossible - no, you do not have to pay admission to Universal to eat at Emeril's. It is located in Citywalk (Universal's version of Disney's Downtown Disney). You will have to pay to park in the parking garage before 6:00 p.m. After that time, maybe you can get your ticket validated? I'm not sure on that, but I'm sure someone else can answer.
There are actually two Emeril restaurants on Universal property. The other one is located inside the Royal Pacific Resort and is called Tchoup Choup. You can either park right at the Royal Pacific ($6 parking or valet) or you can park at Citywalk and take the boat over. I've eaten at both of these restaurants and highly recommend the Tchoup Choup over Emeril's. The restaurant is gorgeous and very romantic on the inside - it is small and intimate. The food is more of an Asian flair which I found more interesting. Possiby the best meal (and dessert) I've ever eaten was at this restaurant, whereas I don't even remember what I ate at Emeril's.... However, the service is EXCELLENT at both of these restaurants.