Witnesses said Nichols tried to push the tree and slipped. He fell and the tree fell on him.
CPR was performed on Nichols, but he died from his injuries.
The family is gathering donations to support Nichols' wife.
"He had a way to drive us all crazy at times and make us laugh and love him in the same moment." Nichols' sister-in-law Amber Burns wrote on the family's YouCaring fundraising page. "We remember him as the fun brother-in-law who made every one of our family trips and gatherings a little more memorable and adventurous."
Burns said Nichols' death leaves a hole in the community.
She said he loved coaching the Yulee Rays youth baseball team.
Several community members and businesses posted about his death on Facebook.