Although it is a small island, commuting in Bali is a constraint mainly because its public transport system is still very erratic and traffic is uncontrollable during peak season.
Southern and central Bali, where most tourists hang out, is very densely crowded and hence the traffic is also terrible here. The rest of the island is covered with rice paddy fields or jagged and rocky ridges and valleys which most often make commuting difficult and slows down your pace. But you will hardly regret any of this since these will help you soak in what Bali has to offer mostly and make your holiday in Bali more memorable and relaxing. You must visit this tropical heaven once to see what all you can experience!
Suggested Read: Places to visit in Bali