This might be a good idea until the rest don't want to be left out.
The letters tell each other that they are going to meet on top of the coconut tree. He meets up with his buddies, B (Becky) and C (Cody). The story is that the letter A (Alex) discovers coconuts sprouts in the tree he hangs out at.
and John Archambault (illustrated by Lois Ehlert). This is where the original book by Bill Martin Jr. The Coconut Tree is the pilot for Chicka Chicka Boom Boom (Series).