We own at and love Harborside, but it would not be my first choice for a romantic, couples getaway. I could think of worse places, though. (I can never understand all those people who honeymoon at Disney, but I know a lot do!) If you do go to Harborside, I would recommend:
* avoiding the main pool areas-- the beach would be better
* if you need to go to a pool try the adults only lap pool by the spa/fitness center (my sister, who doesn't have kids, calls that area "adultland")
* splurge on dinners at Dune (at the Ocean Club) or Cafe Martinique- there are rarely any kids there
* couples massage at the spa (I highly recommend hanging out in the thassalotherapy (sp?) pool afterward)
* if you are into casinos, that could be fun, too
* Plato's in the evening
There are probably more grown-up things to do that I don't even know about, because I always have the kids with me!