if you have a spare day Daz go for this
http://www.champagnecruises.net/
Its well worth it, all the champagne / beer you can drink
great boat, with smaller speed boat, water ski's, donut and wake board what you can use when you get to the private beaches / coves
we had a great afternoon with them at the end of August to celebrate my eldest lads exam results
Although I'm still battered and bruised from all the water sports, didn't feel the pain being half cut at the time
if there's 8 of you it is well worth the money for the full day