Technically, if you want to go there via I-4 between Universal and Seaworld, it isn't going to do you any good, because you can't get there from there, assuming that you are starting from Universal. (The issue is lack of westbound exits directly to Sea World.)
If you mean on Turkey Lake Road, the answer is not a whole lot, it's not a very commercial road. To get to them, you need to exit Universal's property on the back side, by heading north along Universal Blvd when you exit the garage, toward Portofino Bay, then turn left on Vineland and left again on Turkey Lake. Then proceed south on Turkey Lake for awhile (the neighborhood just near the park on this side is a trifle iffy), until you come to Sand Lake Road; there are several restaurants in the Phillips Crossing shopping center on the SE corner there. (Note that Turkey Lake Rd. can also be accessed from Universal property to the South via Hollywood Way, but I don't think that you can get to that road easily if you are parked in the garages. I could be wrong about that part, but if memory serves you are not allowed to exit the garage in that direction. The ramps seem to dump you out with the assumption that you will want to go directly onto I-4. However, if you are leaving from either RPR or HR, then Hollywood Way would be the best route.)
Anyway, after you eat, go south again on Turkey Lake, then turn left on Central Fl Pkwy to cross under I-4, then right on Westwood to approach Seaworld.
Alternatively, you can cross over to the east side of I-4 on Universal and and head south on I-Drive to get there, in which case there are a million places to eat, but you'll be in some seriously heavy traffic there.