If you are unable to get the activities you want online, check the Navigator you receive when you check in at the port for where to go and when to go, to make the reservations. It is not always Guest Services. The location will vary by activity and ship. We were Silver and had no problem getting Palo Brunch reservations once we got on board. It was at the top of our list so it was the first place we went. Then off to another location to make reservations for a couple of tastings. We're still Silver and have been fortunate that we were able to get Palo Brunch, tastings, and a Princess meet and greet on our next cruise. There are Navigators posted online. Find one that is similar to your cruise and look at Day 1 to see where the information is located on the pages.