The Blue Mountains make a good day trip for a limited amount of time type of itinerary. Lots of coach tours available. Absolutely the Hunter Valley overnight is great. Rent a car, drive up early and stay at a B&B. Get a local tour operator to drive you to a few wineries in their vehicle and then return to the B&B for a lovely meal and good niight's rst. Back to Sydney in the AM with a full day available to you upon return. While in Sydeny stop in for a meal at CBD. A smallish restaurant upstairs and a real treat.