CR is pretty easy, IMO… meaning there’s not much that’s not already obvious. I wish the CR-WL-FW boat was running because I really like to use that to make Geyser Point an extension of CRs dining options (cmon Disney!).
As far as the 4th floor observation deck…. If it’s jammed don’t be afraid to head up the exit stairwells for a better/higher view. You still get the audio from what’s playing in the general area, for the most part.
California Grill is my favorite restaurant on property, so I always try to go there whenever possible. I’m not good at booking ADRs in advance but have sometimes (not always) had success with bar seating (my fav) or the mobile walk up list feature. I don’t totally love the current prix fixe menu though.
Have fun!