You see lots of rivers and waterfalls with charming nature during the Annapurna Base Camp Trek. A long trip to the ABC goes through the Ghorepani Poon Hill route, but if you do not have enough time for a long trip, you can also go for a short Annapurna Base Camp Trek from Pokhara, which goes and returns the same way.
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https://www.frolicadventure.com/annapurna-base-camp-trek
https://www.frolicadventure.com/poon-hill-trek
https://www.frolicadventure.com/mardi-himal-trek
https://www.frolicadventure.com/annapurna-circuit-trek
https://www.frolicadventure.com/short-annapurna-base-camp-trek