I lived in Chester until last year (still not far now!) and I would agree, possibly not enough to do for 3 days unless one of those is a race day. As mentioned, Chester Zoo is a full day out. In Chester itself, shops are great, nice selection of restaurants. U could walk the roman walls and visit the ampitheatre (excuse the spelling!) if thats something youre in interested in? There are now plenty of travelodges, premier inn, etc in the city centre, and some nice hotels if you want to spend a little more. Liverpool doesnt take long on the train, nor does Manchester ( approx 50 mins). If you want specific info on restaurants, bars, hotels etc, Id be happy to help