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
10 Specific Questions to ask Kids about School (IMO the list of ten questions were great with my kindergartener. Haven't got the e book, and probably wouldn't read it, but the list got me thinking in a good way.