I always say we never make dining reservations for anywhere, but if you really want to eat at Mythos then maybe make one for there. Few days before or on the day will be fine.
Out of your choices I'll tell you what we would choose.......others opinions will vary of course........
Cowfish.........would definitely eat here twice......we did last year and could have gone a third time easily.....
Confisco Grille is excellent.......and very cheap for table service. We usually eat here more than once too....
Lombards do a lovely lobster roll..........never had a bad meal in there, always excellent and the restaurant is beautiful inside......not your normal theme park place.
Mythos.......never fails to please even the fussiest of eaters.........again, usually visit more than once......went four times one year and every meal was fantastic.
Islands Dining........we like it, especially if the characters are there.......but the menu doesn't suit everyone so would check that out yourself first.
The Kitchen is worth a visit.
The rest of the places aren't necessarily bad.......just not for us. HRC we find too loud. Food is good though.
Finnegans we have tried several times and will not go back.........Antojitos just not a fan of their food......cocktails look good though.
Potter restaurants.....not interested in the food for us, but the atmosphere in both are wonderful......and folks seem to enjoy the food overall.
Don't like Pat o Briens.
Again, just one persons opinion.......I can guarantee you'll get a varying response from others