An ‘interesting’ route is up Dunmail Raise and onto the back road round Thrilmere, then up the fire road (forget the bridleway, which is a carry) to Blea Tarn and then down some amazing grassy zigzags to Watendlath. Next over to Rossthwaite via Frith Wood and up Stonethwaite to Lining Crag (steep carry) and down Grasmere Common.
There’s also a BW parallel to the road (eastside) from Grasmere to Rydal, then take back lane to Ambleside and up onto Loughrigg Fell, turn R at the bottom past the tarn to High Close YH and down the hill into Elterwater. From there you can go over to Tilberthwaite and back before going over Red Bank back to G.