it's a lovely image as is, but like you, I'd prefer it without the haziness. A polarizing filter is the best bet when shooting water, but some adjustments can be done PP to mimic the filter. I had a go at it in PS CS3, using adjustment layers 'levels', 'curves' and a little 'brightness'. I like the resulting depth of colour. Look at them side by side and let me know what you think.
Cheers