What you have is a 10:30 check-in time, not boarding. You will check in and then go to the assigned waiting area to wait. Boarding may not even start before 11:00. It's all dependant on clearing the ship from the previous cruise. Once boarding has begun the process is a little quicker.
How long is the cruise you are contemplating? That will have an impact on the crowd. If it is one of the 3 or 4 day cruises you are more likely to get a younger demographic.
I will be going on my first Princess cruise aboard the Grand. I have tried the search function to no avail so....
Can the balcony dividers be opened between cabins on his ship? Travelling with family and would like connected balconies if it is possible.
If you "reset" making your your new password the same as the old it isn't an issue. The system allows for the re-use of an existing or previous password.
There are at least three other threads in the last two days about this problem. It is happening to many. Just hit the forgot password link and reset your password and all will be well.
Apex and Ascent have 4 dining rooms that are anytime dining, no fixed seatings. go to whichever one you want at the time you want. On the Silhouette there is only one dining room and it has a section for anytime and a section for fixed seating
Your interpretation of supplement is flawed. That has always been one of my pet peeves when people discuss this. OP specifically stated 150% supplement. That intimates a fare plus an additional 150%. A supplement is an amount in addition to the originally set price, so his assessment of a 150% supplement is correct. The charge is 250% of the original fare. If the charges were 200% of the fare it would be a 100% supplement.