wow...not a very good impression of Sri Lanka if that's that happened the first thing you arrive at the airport.
But the civil war is over now and the country is now developing its infrastructure fast (or trying to, from what I can see :P).
Actually there were frequent suicide bombers and bus being bombs here and there, but that was usually outside Colombo. Colombo has too many soldiers and police on the streets, so it was probably one of the safest place at that time.
Wow nice :) so you've visited most of the tourism sites. I feel that Sri Lanka is a great country to visit for 1-2 weeks holiday because it's a small island and yet there is good number of tourism sites, unlike India because it's too big and there are million places to visit, so it's endless.
I remember when I climbed up Dumbulla's one of the temples, this monkey came and stole my flowers...and ate them :P