One of my favorite activities from the past:
When we visited Bangkok (4 whole days!) we got on a bus and rode through the entire city and around the nearby countryside. For the equivalent of 25 cents, we rode for 4 hours, and landed up where we started. People got on the bus with chickens and goats and baskets of produce. Sometimes they'd come over and speak to us, but they didn't know English and I had 2 phrases in Thai -- How are you? and Thank you -- so that's what I said every time. Still, it made everyone happy.

The best tours are the impromptu ones where you get to meet the locals.
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Poet and essayist