I would like a re-imagining of the old Sun Class - smaller, less passengers, alternate ports that can handle a smaller ship.
My only must haves would be Crown Grill, Crooners, Good Spirits and a slightly expanded International Café. Add an aft pool, plus a comfortable cabin with a glass screened shower.
More importantly, the medallion MKII. Slightly modified to sense when you are just about to get thirsty, then orders your favorite tipple for you.