Do your toddlers a favor and refrain from buying them points. Good grief. You have no idea what kind of person they are going to grow up to be. Try to write the script for them and it puts adult-like expectations on a little kid. PP systems are not kid concepts.
My 3-year-old is obsessed with all things hunting - wild game meat, carcasses, hero pics, hunting videos, watching wildlife, guns, animal calls, you name it.
We do some age-appropriate outdoor activities that are fun and have a quick turnaround on a reward - engaging the senses and answering her questions.
All parents are surprised in some ways how their kids turn out as adults. Let them surprise you and celebrate their passions.