Wow! Parking went up since last I was there. Anyhow, you're going to LOVE crusing on Mariner. She, ahd her sister Voyager Class ships are the best things I've ever seen (I have not, however, seen or been on Freedom-which I hear is also Fantastic)
Pack a few things that you'll need for the first few hours after boarding the ship, and carry them on in a small bag,i.e a small gym bag usually works well.
I don't know from the patch-my wife suffers from the same problem, but she found a pill called Bonine (sp) that we got on board, but since we've later found can be purchased at Florid's grocery chain Publix-one pill a day took care of the problem, and since Mariner is so large, unless the seas are VERY rough, you may not even notice any movement. Much depends also on your cabin's location on the ship, fore or aft, etc. If your cabin is located mid-ship (ours was a balcony, 9602 port side in the middle)movement is basically front to back, almost none rocking side to side.
Eastern Caribbean was my favorite cruise-three stops and the rest of the time cruising-wonderful!! Have a great time and relax! Just think of it as a mobile almost all-inclusive.