Children cooled off in the paddling pool at the Thames Valley Adventure Playground's fun day on Saturday.
The annual event was opened with music from Burnham-based group Pop Goes the Choir.
There was a range of activities on offer for new and regular visitors to the Taplow-based playground, which is designed for children and adults with special needs.
More than 250 people attended the event in Bath Road.
Donations manager Nicky Hutchinson said: "There is the chance for people who haven't been before to see what we are all about and it is great to see a lot of children and adults who use the playground anyway."
One of the volunteers on Saturday was Rajni Duggal, who has worked in local Barclays branches for the past 29 years.
She met Nicky in the Bridge Road branch and decided to get involved. Barclays will match anything she has helped to raise.
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