I was going to take the DC's (5 & 3) in May. I figure they're thrilled when they see a dead mouse on the path so a dead shark will be the highlight of their year.
Obviously I don't anticipate being able to dawdle and take in the art for very long with the dc's in tow but it'll make a change to the local park. Someone I've never made it to Tate Modern before so I'm rather looking forward to finally getting there.
AFAIK the skull is only there for the first couple of months. Although it might be too busy for the dc's to see that part.