My family (all adults) stayed at Portofino Bay this past June. We all loved the resort. You can take the boat to CityWalk from PB and Hard Rock Hotel is a 5-10 minute walk from Portofino. Also, Royal Pacific Resort is very close to CityWalk (5 minute walk) so you have good access to any restaurant at CW and all the Universal resorts.
I think Bice would be an excellent choice based on what I have read about it. I haven’t eaten there myself.
Additional places that are adult oriented:
Emeril’s Tchoup Chop at Royal Pacific Resort Pan-Asian
The Palm at Hard Rock Hotel steakhouse (Touring Plans noted that it tends to be noisy)
Emeril’s Orlando in City Walk Cajun cuisine
I haven’t eaten at any of these either, but they have good reviews, particularly Tchoup Chop. Hopefully, someone who has eaten at them will chime in.
We enjoyed VIVO Italian Kitchen at CityWalk. Excellent food and service. However, I’d expect it to be loud on New Year’s Eve and there will probably be families.