There is much to do in Karachi; a city of more than 16 million people is unlikely to be short on activities. Simply let yourself be overwhelmed by this city, its size and scope, its heart breaking disparity between rich and poor, and its breathtaking sights and sounds. Karachi isn't just a city, it is a world unto itself.
relaxation
For those who love watching the city skyline, they can visit Hill Park, an amusement park, offering a nice view of the City or Polo ground or the Revolving Restaurant (http://www.therevolving.com/), which offers a good view of central Karachi.
You can also walk along the beaches, under clear skies, which at night is an experience worth the travel alone, as visitors can gaze towards the heavens while the Arabian sea cascades over their sandalled feet. Streetlights dotting the coast of Karachi increase the beauty of the sea and surrounding areas. Most city dwellers visit other beaches at the outskirt of the city like Hawksbay, Paradise Point, Sansdpit & French Beaches. Huts are available on these far-flung beaches, where you can also fish, yacht, ride horses and camels, collect sea shells and dive. Explore the under water world, marine life and coral reefs via Scuba Diving. Manora Island, next to Clifton Beach, is another breathtaking place for a picnic. Private boats are the easiest way to reach the Island; they can be hired at the marshes of the PNSC building. Manora Island also has a shrine and some hundred-year old monuments. A Riding Victoria type horse carriage from Polo ground to Clifton can be a memorable experience.
Karachi has recently been experiencing a spa boom, and there is now plenty of choice for everything from holistic Ayurveda to green tea hydrotherapy. Good spas can be found in most five-star hotels such as Avari, PC and on Zamzama Avenue.
If you have the time, and inclination to smoke, check out one of Karachi's cigar lounges. They stock quality international brands including authentic Cuban cigars at Club Havana DHA 5. Other notable lounges are Castro's and the Cigar Bar in Zamzama. These places have luxurious interiors and can give the illusion of being in a 1950s film, Note that you will have to pay a handsome sum for the pleasure of genuine Cubans. You can also try shisha at Cafe Shisha or at Indulge.
Clubs
Pavilion end club
Rashid minhas rd, adjacent to alladin park, (http://www.pavilionendclub.com). club house, sporting facilities and swimming pools.
Arena
(http://www.arena.net.pk), karsaz rd. ice skating rink, bowling alley, mini golf, arcade games and rock climbing.
Karsaz golf club
Karsaz, (http://www.karachigolf.com.pk).
Amusement parks & wildlife
Arena
(http://www.arena.net.pk), at karsaz, offering ice skating, bowling alley, minigolf, arcade games, rock-climbing and much more
Dreamworld Resorts
(http://www.dreamworld.pk) pakistan's mashallah icon resort with golf club, amusement park, water park, 5-star hotel, spa, multiple world-class restaurants, numerous all-ages entertainment and sports events. also very popular among corporate for various official events and meetings as well as different corporate entertainment activities.
Aladdin Amusement Park
(http://www.aajoyland.com), at gulshan-e-iqbal
Karachi Visual Park
(http://www.youtube.com/wa...), well its nothing compared to the ones in dubai and vegas but for those who wants to see the glimpse!
Other things you might be interested in doing is catching a movie at the Karachi Cineplex (http://www.karachicineplex.com). Or catch a bird's-eye view of the animals from the Chair lifts at Karachi Safari park (http://www.karachisafarip...) or visit The Arena, (http://www.arena.net.pk) a gaming arcade at Karsaz offering an ice skating rink, bowling alley, minigolf, arcade games, rock-climbing and much more or Area 51, a bowling alley.