Here's 2 easy pick and choose ideas that go with Noah's Ark.
Set some animal cracker packets on the table and let your children pick one and sing a song. Pass out crackers at the end for a handout!
Or you can get some balloons with animal faces on them and let your children pop them. Make sure to put the song inside them! (we found these balloons at Zurcher's, but you could always just draw them on with a permanent marker).