My husband needs wheelchair assistance for boarding. At Pier 27 in S.F., when you arrive look by the wall of the building for wheelchair assistance. They will take you up into the terminal, thru security and then thru check in. They will the leave you in an area with others needing assistance. A Princess employee will then push the wheelchair up the gangway and onto the ship. They will usually take you to wherever you choose to wait for the rooms to be ready (buffet, lounge etc). A tip is always appreciated. There is a separate check in line for those needing assistance, no need to worry about the blue/green lanes. I don't know if they will take your whole group of 15 so you may need to split up and set a place to meet on board. Happy cruising!