If you choose a Novgorod day tour (the city is often referred to as Novgorod the Great) from St. Petersburg and decide to travel by car/van/bus, then the tentative iotinerary for your tour will be as follows:
8 a.m. -pick up fro your hotel, depart for Veliky Novgorod (Novgorod the Great)
11 a.m. – arrive in Novgorod, meet your personal tour guide.
11:00-12:00 – tour of the Novgorod Kremlin. Inside visit to St. Sophia Cathedral. Millenium of Russia monument.
12:00-13:00 – walk across the Volkhov river. Yaroslavian Courtyard. Driving city tour.
13:00-14:00 – lunch/snack/coffee-break (local restaurant of your choice)
14:30-15:30 -Tour of Vitoslavitsy (Wooden architecture museum)
15:30-16:00 – Tour of St. George monastery
16:00-17:00 – free time (possibly for shopping or walking or a coffee-break before departure)
17:00-20:00 – travel back to St. Petersburg.