If You want to go inside city center, You can go by foot or by tram. Zagreb has got good tram network and tickets can be bought at newspaper stand, by mobile phone (SMS number is at every station) or driver can sell it (a bit more expensive).
Outside city center trams do take You a long way, but then You might use a bus if You want to go on hills, or travel outside city limit or some more remote parts of the city. Bike can also be used, but the number of bike tracks is small and drivers are not too careful.
Rail and road.
train
The bicycle like in the rest of China
your own vehicle or the local bus !
Horseback or wagon, on foot or by water
The main form of transportation in Australia is the car.
Car. A train lines passes through, there are some buses and you can walk, but a car is the main way around.
The capital of Croatia is Zagreb. Zagreb is the capital city of Croatia.
The main mode of transportation in Greece is the Ferry Transport.
The main form of transportation in Australia is that of hopping and flying on boomerangs.
the main modes of transportation in cuba are bikes, cars, trains
Petroleum is the main source of energy for transportation.