Will we be able to find free on-street parking (or in a supermarket parking lot) on a Sunday afternoon in May that's not too far from the cathedral? I was thinking of parking at the Museum of Lincolnshire Life for free and walking to the cathedral but hear their parking is fairly limited. About how long will it take to tour both? We're coming from York and after Lincoln we need to stop in Graveley where my husband's ancestors are from and then return our rental to Heathrow before overnighting in London so it will be a long day. Hopefully my family will think Lincoln was well-worth the detour. Thanks for your help.