Háizimen zài guǒyuán lǐ cǎizhāi cǎoméi, wán de hěn kāixīn.
The children had a great time picking strawberries in the orchard.
Tips
usage
采摘 specifically refers to picking fruit, flowers, or similar items from plants by hand. For harvesting grain crops one would use 收割. 采摘 is also used in agritourism contexts (采摘园 = pick-your-own farm).