My neighbor made wooden kazoos. He is 75 and he passed them out to his siblings and he said that had a wonderful jam session. Instructables has the plans Wooden Kazoo
Young and old alike will enjoy making beautiful sounds with your tone-of-fun tongue drum by striking the slitted top of this six-note, easy-to-build instrument.
And I was thinking pink elephant disruptors. If you blast one every morning standing on one foot and twirling, you won't have any pink elephants leaving deposits on our lawn.
Wood block vibes are a great idea. You can even design it so next year, you can add another block octave.
Thanks much for these ideas and those yet to come.
FWIW, remind me at the picnic, and I'll demonstrate a train whistle without the use of any other devices except those you are naturally endowed with. Look ma! No hands. No tools. Of course there was several hours of throat pain, but.... I did perform once with the Jim Beam band at the distillery, LOL!!