If you need a drink package / internet / specialty dining book those on the Cruise Planner, as they are usually available at a small discount, and occasionally at a larger discount. If you do see a better deal but have already booked something, cancel that booking and rebook at the new price.
If you're not up to doing the drink package, a 10-drink punch card usually shows up around Day 4. You can get drinks with cost up to $13 for around $9 per punch.
Johnny Rockets is one of my preferred breakfast spots as it's one of the few times the Boardwalk is quiet. You get a slightly obstructed view of the water as well.
Mini-bites is also open for breakfast. It's a limited buffet but they also have eggs to order.
MDR is sometimes open for breakfast and lunch (custom salads and a lunch menu). Much less crowded than the Windjammer. If you've been on
DCL then expect WJ to be like Cabanas at breakfast and lunch.
Avoid the Promenade during a sale. Since this is your second RCI cruise, you probably know that already.
Outside the Promenade is the running track. There are a few nooks and crannies where you can look out onto the water and chill out. It's nice if you don't have an oceanview balcony.
Enjoy!