I came across a news report about a charity called Dreamflight which send a group of seriously ill and disabled children to Orlando every year from the UK.
A quote from their web site follows...
Dreamflight is not just a holiday. The children leave their families behind giving them an opportunity to discover independence, confidence, and a whole new outlook on life. Often for the first time, these children realise that they are not alone, and they are not the odd one out. They see children around them who have also suffered, they gain perspective, and experience things they never thought possible.
They are currently in Orlando and their happy antics can be followed on their Facebook page.
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