There were plans to build a water park (Europes largest i recall) in Newhaven. Plans failed due to investors pulling out. Cannot see why they chose Newhaven as location, hardly accessible.
Side question - What are the plans for Preston Barracks? Have seen the sign outside the front saying it has been aquired for redevelopment however that has been up for at least 10/15 years.
Black rock - unless there are plans here as part of the Marina regeneration/extension
Toads Hall valley - Sure I read somewehre that there was being a large housing estate being built there. Can the council make the developers there pay part of the cost of the leisure centre. Would also beneifit...