When Hilary Sandlon began the countdown to her 22 nd birthday, she didn't think of all the presents or the kind of party she wanted.

Instead, the Seton Hall University senior thought of how she could help others and how to do it in a big way.

Sandlon, of Belvidere, N.J., came up with the idea to do 22 random acts of kindness to mark her 22 years on Earth, dubbing it "Hillary's 22 Random Acts of Kindness."

Though her birthday was on July 23, Sandlon, who could not be reached today by ABCNews.com, began thinking about her acts of kindness more than one year ago when she saw a Pinterest post from a woman who did the same thing for her own birthday.

Sandlon began making her list of random acts back then and, this July, her birthday month, embarked on a five-city, 10-hour random acts of kindness tour with her boyfriend, Evan Reed, and best friend, Meghan Cox, both of whom also could not be reached today by ABCNews.com.

"It is so nice to see that the kindness is spreading in different areas," Sandlon, a nursing major, told her school's newspaper, The Setonian. "It makes you truly believe that a good change is occurring by helping others."

Sandlon's list of random acts included everything from leaving a surprise gift for a mailman to paying the toll for other drivers, donating blood, putting carts away at Walmart, donating clothes and bringing brownies to neighbors. The trio also brought doughnuts to a local police station and weeded Sandlon's grandmother's front yard.

"I wanted to do something big to show that helping others has a contagious rewarding feeling that comes with it," Sandlon told the newspaper. "I wanted to make a difference, even if for one day."

"The love I received back was overwhelming," she said.