I cant think of anywhere in the park where you could cash them. In fact we holiday in France every year and have found that in general over the last few years its become harder to cash them. We have been refused in several banks and one bank only accepted them when they found they were Euro cheques as opposed to stirling. So last year we took Euros and used card to withdraw money however this year it was so much easier.
As I posted on another thread:
Thanks to info on this board before we went at Easter we got an American Express Travellers cheque currency card. This enabled us to load it with Euros online before we went which we then used around the park, village etc. There was no commision and you could add as much or little at a time but it did cost £20 to set up but well worth it. The exchange rate was often better than postoffice rate.
I would recommend this card