You can take a bus from Pathein or Yangon. The roads are not that good, so for the about 210 km from Yangon it will take about 6 hours, depending what bus you take. You can also go by boat from Yangon to Pathein.
You may rent a bicycle or take the bicycle taxis. Renting motorbikes is not a good idea, otherwise the unspoilt place will soon become like an overcrowded Thai beach resort.