FOXBORO (CBS) — When 5-year-old Danny Nickerson of Foxboro died from a rare cancer in April, he left a friend who resolved to do what he could to fight the disease.

Danny was the little boy who wanted only cards for his birthday, and got truckloads of them.

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Danny Nickerson, seen after receiving thousands of birthday cards in 2014. (Image Credit: Daniel's Journey)

Danny Nickerson, seen after receiving thousands of birthday cards in 2014. (Image Credit: Daniel’s Journey)

Now, 6-year-old Ryan McGuire of Foxboro is planning to play 100 holes of golf in one day in hopes of raising $5,000 for pediatric cancer research, in memory of his kindergarten classmate.

Visit His Golf Fights Cancer Donation Page

“He was a good boy. He was a really nice friend,” Ryan told WBZ NewsRadio 1030’s Lana Jones. “I liked to play with him and read books with him.”

Ryan’s grandfather, who beat prostate cancer, will be his caddy on June 17 at MGA Links in Norton. Ryan would be the youngest to ever complete 100 holes of golf in a single day.

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“I’ll probably take breaks and have food,” Ryan said.

Ryan says he’s missed his friend Danny. When Danny died, his class let go of balloons in the playground at recess.

“You could actually still see them when they were just like dots,” Ryan said.

His mother asked, “Where did they go?”

“To heaven, probably,” Ryan said.

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WBZ NewsRadio 1030’s Lana Jones reports: