3 days in KL

Day 1 - visit all KL landmarks such as Twin Tower, KL tower, eye on malaysia, historical buildings like sultan abdul samad building, merdeka square, the railway station, garden n parks. if you have time, go to putrajaya. its 30 mins from KL

Day 2 - street shopping! good place for street shopping are petaling street, jalan masjid india, jalan bukit bintang, jalan tuanku abdul rahman.. apart from the street u can try KL malls as well.

Day 3 - maybe u can visit some cultural places like central market, kraftangan malaysia. visit istana budaya, see if they have any shows.

for more info you can log on to http://www.tourism.gov.my/

hope this helps!