Eurodisney & Dinner Cruise...Paris

Hi, just a quick couple of questions:

We are heading to Eurodisney (just for a day) and have seen on the internet tickets for about £30 - is this the general price (i.e. is it about the same if you were to buy them in Paris)? Is it easier to have the tickets before leaving the UK?

We also want to do a Seine dinner cruise...again we have seen these on the internet but I imagine it would be probably be just as easier to book there, and there would be more choice? Any comments welcome!

Oops more than a couple of questions! Thanks.

Kirsty

Oh, just remembered another one...has anyone done a day trip to see the Chambord Chateaux in the Loire Valley (from Paris)? Did you do a tour or off your own backs? Would prefer to do it ourselves but not sure how much of a mission it will be! Thanks again!