Which detail would be most relevant to this central idea? Summer is the most fun season, because there is so much to do

A relevant detail to support the central idea that "Summer is the most fun season, because there is so much to do" could be: "During summer, people can enjoy a variety of outdoor activities such as swimming at the beach, hiking in nature, attending music festivals, and hosting barbecues with friends and family."

This detail highlights specific activities that contribute to the fun of the season, reinforcing the central idea.