Popular places to visit are Chinatown, Batu Caves, KL Tower, Petronas Twin Towers, Central Markets and the major shopping complexs.
Further out of KL bout 1-2hrs drive away is Genting Highland featuring Casino and Theme Parks. Further is Cameron Highlands featuring green mountains, fresh food and place to relax.
How hot? It depends on the weather, it has been really HOT these few weeks. If it rains then it will be cooler.
Else just pack light. You dont need any heavy clothings.
I am not sure if there is a restaurant at the Petronas Tower, but there is one Revolving Restaurant at the KL Tower serving buffet dinners.
Dont think you need any jabs.
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For every wound, a balm.For every sorrow, cheer.For every storm, a calm.For every thirst, a beer.