As others have posted, everything except shore excursions are included for the YC. For lunch, I ordered 2 lobster rolls and the salad. When they arrived, I dumped the lobster on top of the salad and ate away, discarded the rest! FWIW, we rented a oceanview Cabana since the "oceanfront" cabanas were all booked...I put in "" since the oceanfront cabanas are actually located on the tree line, behind all the YC chairs and umbrellas. Based off posters on this forum, I spoke to the YC Concierge (luv them!!) and requested Cabana #7 which is the closest to the Ocean House. On the negative, it was missing the 2 sitting chairs and did not have a ceiling fan like the other Cabanas.
However, on the positive (and there are many in the YC!) side, the waitress was always around and quick with drinks (sailed with our 2 23 & 24 year-old "boys")...which were frequently requested! 🙂
For our Nov Meraviglia cruise, will spend the extra $50 to get an ocean-not-oceanfront Cabana to have more direct route to the water. Highly recommend wearing water shoes.
And to answer the question floating in the room, it was $400 for our oceanview Cabana for the day and $450 for an oceanfront Cabana. We found it worth every nickle as DW is a shade lover, and DS2 gets overheated.