Just wondering how e-check-in works at Hilton properties when you can get a preferred room upgrade upon check-in? Can you get the upgrade online, 24 hours ahead of time, or is that something you can only get when you are physically at the hotel? In my case, I was hoping to book a standard room get an upgrade for a stay we have planned for next year at the Hilton Hawaiian Village, but wondering if I should book the cheapest room in a certain tower in order to better my chances of an upgrade? We'll be arriving at the hotel quite late (flight gets in at 9pm), so I am hoping that e-check-in will better our chances of a good room upgrade. BUT I have no idea how it works! Thanks for any advice!