A total of 6 of us will be boarding a celebrity alaska cruise this Friday at Seattle. Three of us flying from LA, including myself, three others driving down from Canada.

My flight will be arriving SEA around 9:30am. My question is,
1) We booked 3 rooms total, will it make a difference whether checking in together, or separate ?
1) what time can we, and should we, show up at the dock for check in ?
2) will we be allowed to exit the ship after checkin and do it a little shopping around town, buying booze and water and snacks all that ? If not,
3) Is there a place where we can keep our luggage for a few hours while we explore Seattle in the morning, until we go back to check in, say around 2pm ?
4) are there any limits on luggage you can bring ?


Sorry for the ignorant questions. I'm a super frequent flyer, 300K miles / year, but this is my first time cruising.