10US for the tuk tuk, if you are good at bargaining, maybe you can get a better price.
Generally, it's not worth visiting these temples. They are not that great, except for the models maybe. If you have extra time, better visit Pre Khan or Ta Som.
He organizes free concert to pledge money for his children hospital.
He works for Kantha Bopha. He used to look young and healthy, but now, he's an old man who has problem breathing.
I have to decide whether to save the children or spend the money to buy cold drinks? I just realized I can do both. So I donated 50 dollars, to collect some positive karma.