Kuala
Well, if you can't climb lots of stairs, don't bother with batu caves. There are a few other things to see there but not worth the trip. I took the hop on hop off bus and that was helpful. Of course, you want to visit the twin towers. I stayed at the Marriott Rennaisance hotel and across the street from that was the Malaysia dept of tourism. They had a buffet and cultural experience at night which I would recommend highly.
I did not do the Curry as I am not a fan. The airport is quite a way from downtown and is in the middle of a rain forest but you can take mass transit to the airport. I flew Malaysian airlines and I was really unhappy with them. The price is right but had many issues. Perhaps the biggest was flying them back from Bangkok. They decided to cancel my flight AND THEN they rebooked me a day earlier so that I would spend 10 hours in the Kuala Lampur airport. Who wants to be booked home a day early from their vacation especially since I was staying at the JW Marriott and spending big bucks. After several unsuccessful attempts to change this,, I finally went to the ticketing office in downtown Bangkok and got them to change this to the original date.
One thing that surprised me was how large of a percentage of the population was Muslim. There is nothing wrong with that but I was warned not to spend a lot of time in the countryside.