Meeting people with a smile
The Prophet (sal Allahu alaihi wa sallam) said, “Do not disdain a good deed, (no matter how small it may seem) even if it is your meeting with your (Muslim) brother with a cheerful face (i.e. with a smile)”
Every deed approved by Islam is considered good and rewarding, no matter how small people may consider it.
Even to meet people cheerfully (i.e. with a smile) is a virtuous deed, though it may appear quite insignificant to some people.
And Allah knows best!