We came home from our holiday early as looking after dd2 in a caravan was a nightmare, trying to find places to take the dd's was really hard work and we needed more sleep (dd2 would not sleep) .
We decided to have a day out closer to home (somewhere where dd2 could run around without causing trouble) so we went to Moors Valley near ferndown Dorset. We had a great day out, dd2 could run around, climb and make noise. The toilets were great (disabled ,baby changing and small toilets that dd1 could use), the cafe was a good size (enough room to get a pushchair/wheelchair around the tables), lovely picnic area and a park to suit all ages.
A great place to go with SN children.