How do I go about wing walking for charity?

I want to Do A Wing Walk for Charity. My 3 year old Daughter was Diagnosed with A.L.L. ( Acute Lymphoblastic Leukaemia ) On 23Rd June 2010 At The Birmingham Childrens Hospital. As A Thankyou I would Like to do a One off Charity Wing walk and be able to Get enough Sponsor Money and Hand Them a Nice Cheque . The Clinic and Everyone at the Hospital Do a Fantastic Job and I just want this to be my way of saying : Thankyou