This is one of my son’s favorite websites:
This site is really great. My son loves the Divine Mercy Chaplet show. The site takes a little bit of work to figure out how to navigate it, so I suggest looking at it before when the kids aren’t with you. The trick is to go to the “treehouse” and view the map. This will give you a list of all the activities/prayers/lessons. Then click on the picture of the city and actually go to whichever building has the activity.
Here are some great sites full of activities, crafts, lessons, prayers: