Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
Surprise kids when they wake up from nap maybe in gym or something. Check out this wonderful activity that encourages balance, motor planning, coordination and body awareness. Weaving through a rainbow by Teach Preschool
Fun Kid Activity: Lines of Colored Tape, straws and pompoms. Try straws and cotton balls. Adding the lines ups the challenge. Using pompoms allows you to adjust the size from tiny to pretty big. The pompoms are also nicer looking.