Concur on calling. We didn't have a DVC room and while Aulani's online checkin form has a section for room requests, I honestly found it useless. For us, we had a partial ocean view room booked, it offered only one option to choose from for Room Requests (which we didn't want) and no free text box in which to type anything. So, I ended up calling the main Guest Services line to put in our request.