If you are looking for good, cheap fun for the kiddos on the weekend, Skate Zone on Van Buren offers skating lessons every Saturday for only $5.  The kids that work there are amazing!  They are so patient and sweet with the kids.  The lesson is from 10-11am, then it is free skate.  From 11-12 the free skate is for the kids doing lessons; the rink doesn't open till 12 for regular hours.  We love this place!
http://www.skatezoneaz.com/