Google maps shows it as being about 7 miles apart. Coming from a driving city, I really have little experience with walking and I don't know how far that really is to actually walk. I also want to be sure I "save my strength" for the tours, as they are all walking tours so I will be walking all day long. It looks like there is a bus that goes to the city centre, so I think that will work out best. Or at the very worst, a taxi will work.
Thank you so much for your help, peedal! I just get very nervous about getting lost!