When deciding between two options, such as whether to use “between” or “among,” use the word “between.” When deciding among three or more options, use the word “among.”
Tiny Tim, with his ukulele and falsetto voice, went tiptoeing among the tulips, because there were more than two tulips.
Just between us two, there is an exception. You can use “between” when you are talking about reciprocal relationships shared by two or more.
Example: “The unitization agreement between the four operators was signed today.”
Fun Fact: The ukulele is a Hawaiian stringed instrument, and according to my Hawaiian friend Lori, it is pronounced “OO-koo-lay-lee,” not “YOU-koo-lay-lee.”