I'll sing you one-o, we are the campers-o.
What is your one-o?
One is one for summer camp, and ever more shall be it
so!

I'll sing you two-o, we are the campers-o.
What is your two-o?
Two, two, tie dyed shirts, drying in the breeze-o
One is one for summer camp, and ever more shall be it
so!

[Continue: adding each verse and repeating backwards to,
"One is
one for summer camp, and ever more shall be it so!"]

Three, three, the mosquitoes [ouch!];
Four for the icy waters;
Five for the kyacks on the lake;
Six for the midnight hikers;
Seven for the evening thunder storms;
Eight for the outhouse cleaners;
Nine for the yummy cookouts;
Ten for the caterpillars;
Eleven for eleven hours' sleep all week;
Twelve for the awesome counselors.