Also, Street has Clark's Village, a huge outlet village, with a large Clark's outlet. Perfect for stocking up on school shoes!
Can second Brokerswood, canal walks or hire a canal boat.
Bath has several walking trails. Frome is home to Lilley's cider (all sorts of flavours) for the adults!
Salisbury is within an hour of Frome, lovely to have a walk round, ditto Wells.
I love the Bookbarn.
A gentle one, is Hope Farm nature reserve, charity run, on the south of Trowbridge. Lots of animals to feed.
Wells and Bath leisure centres have great swimming/leisure pools.
The Two Tunnels walk/cycle path is amazing, a converted railway line, one of the tunnels is the longest tunnel open for the public in the UK. You can hire bikes, and it is part of the National Cycleway (can't remember the route number)
Wellow trekking centre for horse/pony trekking.
It's a lovely part of the world!