M.S.
You are so lucky that your son has napped till now. The twins quit napping during the day before 2! And my older son quit napping at 2. What I do is quiet time. They can have music on, but they need to stay in their beds and read a book for a little while. Sometimes they don't stay in their beds, but in their rooms. One looks at books the other plays cars either on his bed or on his floor and my girl either plays with her doll house or reads books. It gives me some quiet time and I do this for a designated 1/2 hour and sometimes they play like that for an hour before they are ready to be up and running again.