We've entered this really fun stage in parenthood when our children are finally old enough to play games that are actually fun for us, too.
Hide and Seek is a perennial favorite. As is Red Light, Green Light.
Tag is also up there, but since Charlotte doesn't like tag as much, I mostly end up chasing Ella (or being chased) while carrying Char. The upside of this is that it really evens out the game. Six months pregnant lugging a two year old vs. a spry three year old. You can only imagine.