Branston Water Park is a lovely area to stop with an easy walk around the lake. The added bonus is the Bridge at Branston does excellent Italian food but you will almost certainly need to book. A walk through the tunnel under the A38 will get you to some local shops for supplies. It's been some years since I tried the Erewash but iirc the first few miles are quite urban. No doubt someone with more up to date knowledge will be able to verify that.