letter toss game - working on balance, visual motor control and letter recognition. Can also do on outside on the ground with chalk and have the kid jump to letters (they might spell a word, just recognize a letter, or combine chalked words to create a phrase). Could do this on a trampoline!
DIY Montessori Inspired Sensory Letters - Make your own sensory letters to help little ones learn proper letter formation. Sensory letters are a proven effective way to help kids learn and retain how to write their letters.