Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.
This color sorting train is a great way for kids to learn colors. They can also work on counting. A fun color recognition activity for toddlers and preschoolers Could have them run around room grabbing toys to match to colors.
Kids would love to decorate their own rings and put their names on them. When their ring lands around the roll there could be a special activity or prize. Great idea - thanks for sharing it! DIY Paper Plate Ring Toss Game - great for kids!
Easy Indoor Activities : Rainy Day Activities, Snow Day Fun for Kids