Thirteen people took part in the sponsored walk to raise money for five-year-old Alicia Pannell.
Alicia's parents Lee and Sharon, of Parker Close, Gosport, have been fund-raising for the past two months to adapt their home and buy Alicia a special hydrotherapy bath to help with her severe cerebral palsy.
An anonymous donor gave the couple the cash for the adaptations, and so the £500 raised from Sunday's sponsored walk will now go towards Alicia's bath.
Liz Creed, 35, of Eversley Crescent, Leigh Park, arranged the walk. She said: 'It rained from Leigh Park to Portchester. We got absolutely soaked but then the sun came out and dried us off.
'It was very tiring but everyone had a great time and we were greeted at the finishing line by Alicia herself.
'She's such a lovely little girl, it made it all worthwhile.'
Family and friends of Mrs Creed took part in the walk, and Alicia's dad Lee also took part.
Joe Chamberlain, the landlord of The Wheatsheaf Pub in Gosport, where the walk finished, was among the walkers and also laid on drinks and food at the end of the 15-mile trek.
Sharon Pannell said: 'It's been fantastic. They've all done such a good job and we're so grateful for the money raised. Alicia had a lovely time meeting them all.'