On South Pier in summer you will find some scary looking rides like the Skyscreamer (I don't even want to know how this one works I think ;) or the rollercoaster right at the end of the pier (I bet you get scary views from there). There's also a cinema and a restaurant here.
We walked underneath the pier when the tide was still low. It was lovely to see the pier from here. Many evil looking seabirds just waiting to ruin your clothes or hair though ;)