Travel in KL
The easiest way round KL is Taxi - VERY cheap. Sadly they all go missing when it rains. Similarly when it rains Scooter/Motorbike is very unsafe. You cannot see what is on the road and you get soaked instantly. Not Fun.
Monorail is brilliant. Apart from the minor problem it doesn't really go anywhere you want to go to.
KLIA Ekspress is excellent. Fast, cheap and direct to the Airport from Sentral
LRT is good - more stations - but not necessarily going where you want to go.
Car is dry, safe (ish), and cheap too. Road signage is very poor. Roads (even motorways !) just disappear (eg the MEX northbound from PutraJaya). Most car parks are under cover so you need never get wet.
You cannot walk anywhere - the pavements are usually shot/missing etc.
I have seen the odd cyclist - the last one was battling hard up a hill and in trouble with the traffic - very dangerous. I thought this guy has to be a Brit !! I met him 2 weeks later in a bar - he was a Brit !