I left the Orlando area in 04, so don’t think I’ve much to offer in terms of restaurant recommendations.
I totally agree with @Plumeria on eating grouper, though.
For an interesting experience, Lone Cabbage Fish Camp, off 520 and a couple miles east of I95, in Cocoa (not Cocoa Beach) is very “Florida”: I recall a lot of fried food and plenty of local color:
High Tide Harry’s off Semoran in Orlando was a regular spot for us: recall enjoying the conch fritters:
If you’re looking for food to go, the Publix Supermarket chain has a decent deli and bakery. (My deathbed meal would likely include one of their cinnamon rolls - softball sized with cream cheese frosting.)
I know there’s been a lot of developments off 50/Colonial Drive toward downtown with immigrants opening restaurants and introducing new dishes to the community. No idea if it’s “good ‘X’ for Orlando” or just plain good.
Some discussion of the area on HungryOnion (though not recent):
Edited to add:
Googled the Hilton location; given the number of people you’re traveling with, and the resort location, you might be better off eating there or at one of the other resorts/theme park areas.
The theme parks are all set off from Orlando proper which can make getting to downtown/elsewhere challenging.