Better go by yourself!! most tour operators will definitely charge a premium of atleast 10% to 15% above the actual cost and hence to cut cost plan a trip yourself. More over tour packages have restrictions regarding timing as well as places if it is a group tour. If you are travelling solo or with a group of friends stay at hostel, use public transport and like wise you can meet new faces and also can explore the place in a better way and also save a lot of money which you can otherwise use for trying different cusines or shopping.