Hi the playwales website and links on this page are a great tool -
inclusion, disability and risk
I have a right to play out too! from kids.org.uk
Maybe look at the environments where play happens for you, the age range of children who visit, the activities you know are provided, the ones children are able to initiate for themselves and then how you'd ensure anyone with mobility or impairement is able to take part.
could you draw up a plan to examine & develop your landscapes - making footpaths and bridges more accessible, secure funding for adventure playground, art, craft & design resources.
http://www.playwales.org.uk/eng/adventureplaygrounds
http://www.playwales.org.uk/eng/richplayenvironment
Hth xx