That’s a nice loop although a little muddy (and some of it bloody steep!)
If you’re feeling fit, after you do the downhill from Conkwell, you’ll come out onto the canal towpath. Go straight over the A36 and up the footpath straight opposite (don’t worry it’s a footpath, everything else on that route is but this one is too steep to ride!) and you’ll pop out at the top of Brassknocker hill. Turn right, go to the university. Go through the university and to the golf course beyond. ride around the edge of the golf course and you’ll see some tracks off into the woods, dropping down. Follow these, these are fun. It’ll throw you out onto the A36.
If you’re not feeling fit, at the same point, follow the sustrains bike patch blue signs away from Bath and you’ll link into he two tunnels, which although on road, is nicer than a wet canal path as well as having musical, illuminated tunnels on it.