The Math section in particular has some wonderful activities for K, 1st, and 2nd grade students.
Here are a few of my favorites:
Feed Freddy is a great activity for little ones. Freddy grows when you feed him numbers, letters, colors, shapes, and patterns.
Order is a great ordinal number game. Students place the race cars in the correct order that they finish the race.
Pattern Bridge is an activity where students cross the bridge by placing color squares at the end of the bridge.
Number Bridge is similar to the above activity except that students cross the bridge by filling in the missing piece of the number bridge.
More or Less is an activity where students choose bugs with more or less legs and feed the monster to watch him grow.
Addition Scale is an activity where you add the numbers on the scale and add a new number on the right side to balance it. Can you get to 15 numbers?