My neighbour friend told me about this place - and it was free this day. They have a pet shop/vet area, a lego table, a music section, a stage with costumes and a puppet stage, a camping area and a craft room with supplies. We were the first to come and the last to leave. The boys loved it.
(What he wanted to do with the mask "to pay for it" was to "beep" it on that grey microphoney thing. Beep! I guess nothing escapes their notice - and they do come with me to the grocery store at least once a week.)