If you're one of the unfortunate people who are magnets for mosquitos, if you will be in Negombo after sunset then make sure you don't forget to bring your counter measures. There's plenty of the little blighters.
No one is following behind the dogs on the beach with a pooper scooper.
And, as my husband learned the hard way, personal belongings left on the beach in the bath of a stray dog is territory waiting to be marked.
The one thing that really disappointed me about Negombo was, although there are some beautiful beaches and lagoons, the government just doesn't seem to care about them at all.
If you wander along the beach you'll find thousands of plastic bottles, dead animals, and litter spread accross the beach. It's such a shame that something so ugly has to ruin somewhere so special.
We have never felt unsafe in Sri Lanka. We haven't met lots of beggars either, only on the beach in Negombo there were lots of children begging for money. They are hard to resist with their big black eyes but our driver insisted NOT to give money to the children. They have free eduction until the age of 16 and "earning" money this easy will keep them away from school. These children are the future of Sri Lanka. Help them to have a better future than their ancestors. Don't give them money. If you want to bring something for the children, then bring ballpoints or so.