[RedRoseSAI]

I would definitely stay in the city and pay the extra $30 just to be closer to all the attractions. Otherwise, you'll need to drive in and out of the city, which is way more hassle than it's worth (the suburban trains stop running at midnight, BTW). $30 a day isn't bad, although you may be able to find rates for a little less at nearby garages (of course, then you won't have valet service). I'd just park your car at the hotel and leave it there.

If you do stay in the city, for the love of God, do NOT drive to the tourist attractions within the city!!! Take cabs and the L unless you need to go outside the city. I've never stayed at the Hard Rock, so I can't comment on it.