Here is the original scene from which I transposed the monk to your more appropriate environment on the jetty by the river.
As he gazes upon those tourists he's probably thinking, how foolish they are. In a few years time, they'll start suffering from ill-health and the consequences of obesity, lack of exercise and overindulgence. They'll be worried about the size of their pensions, the loss of their possessions, the future of their grandchildren, the ravages of climate change plus a whole raft of concerns they can do nothing about.
On the other hand, he could be thinking, "What am I doing here, watching the world pass by. I could be driving these tourists around in a Tuk Tuk, making lots of money and having a good time."
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Don't ask me what that foot is doing in the bottom right corner.