I actually thought the Curacao Marriott (Emerald Beach) was one of the nicer ones. Nice beach, pool area, Caribbean Sea Sports on-site for diving, small casino, beachfront restaurant etc. But their dive isn't the best, the reef is out past the bay so it's a little farther swim out.
About a 10min. drive to downtown from there. Most of the restaurants/nightlife are downtown or slightly farther east along the beach. There was something loud going on at the Marriott one night. Pirate Bay is a decent beach bar walking distance away also - they'll have music later in the week. It's a tables in the sand kind of place.
Since Piscadera Bay is sort of north Willemstad, the better western shore dives are 15-45mins. drive away. There's also a Renaissance downtown but there's no diving there - they shuttle divers from there to CSS at the Marriott Emerald Beach.
Not much golf on Curacao - Blue Bay or Santa Barbara are about all. SB looked nice when we drove by. I play so I notice. The most golf is going to be either St. Kitts or Barbados. Barbados has several courses, St. Kitt's does/will soon. There's a new project by Ian Woosnam going in there -
Kittitian Hill. Supposed to be 3-4 courses eventually. Although I think the best course there currently is the Four Seasons - on Nevis - not St. Kitt's.
My friend was certified on Barbados. Her sister lives there so she goes occasionally. She dives regularly in the Caribbean. She also mentioned it was fished-out - in fact when we proposed a group trip there, her suggestion was to go elsewhere. YMMV.