I have not had a Vista Suite but I have been in a mini-suite just a couple of doors down the hall from you; and yes, we found it to be very quiet and pleasant. There is no foot traffiic past your cabin and there are cabins above and below you. And you only have a neighbor on one side.
We love the location; two decks down to the Promenade; three down to the dining room; and it's very close to the aft stairs and elevators which go right to my favorite part of the ship--the Horizon Terrace, with the buffet, pool and Outrigger Bar.
The only noise or vibration we ever noticed was from the thrusters when docking; and that only lasts a couple of minutes.
We went to Hawaii last year (on Island Princess) and really loved it--especially the long, lazy days at sea. Have a wonderful cruise and please stay in touch.