I am meeting my Dad and his wife who is disabled half way-which turns out to be just south of Bristol, for a Saturday lunch in a couple of weeks.My son who is 2 will need to burn off steam after an hour and a half in the car and parentals will be wanting good but not posh food without having to walk far.Please help,Jx
Stourhead near Longleat just off the A303 is really nice - nice cafe, lots of open space for small people but you'd have to check out disabled access for the open areas..... Might be a bit out of your way but thought I'd mention it !
There is a cafe/bistro at Ashton Court if it is dry (the cafe is indoors but your DC could burn off steam outdoors). 10 mins from the motorway.
There is a Pizza Express in Clifton village, again 10 mins from motorway, which is very child friendly. Park on the Leigh Woods side of the bridge as loads of free parking, walk over the suspension bridge (there is a play park on the left on the Clifton side) and PE is a 5 minute walk.
No 5 The Beach in Clevedon is child friendly too. There is a park on the sea front, a walk on the pier which has a tea room at the end.