Amphitheater with sail type canopy so it can be used year round, have free cabarets throughout the summer in the evenings like holiday resorts have with a variety of acts. Can also be used for payed attractions. Incorporate snack bar and gift shop.
The larger presence of families on the seafront will also reduce anti social behaviour. It will also benefit other local businesses/traders.

Address or location of the idea 
Built to the west of the current pier, alter the promenade and build out over the stones, joining up with my idea forswimming pool.