Transportation in Bali is relatively cheap, and the most popular method of transportation is by hiring a private driver. A private car with a driver will cost you around $40-50 USD per day. Public transport is also available but may take longer and be less comfortable. If you prefer to drive yourself, you can rent a scooter or car for around $5-20 USD per day.
If you have more time, you can add some extra days in popular tourist destinations like Ubud or Seminyak. If you have less time, consider cutting down the number of places you visit in one trip. Keep in mind Bali is a popular tourist destination, so book your accommodation and transportation in advance during peak season. Remember to dress modestly when visiting temples.