Bali seen from a bike is far more engaging than one seen from a speeding car. There will not be one village where the children don’t stop what they are doing to wave and cheer you on. Stick to the back roads as much as you can. A full-day tour with a reputable company will cost anything from about Rp 500,000 and will generally include bike, lunch, and a local English-speaking guide. Multi day tours either circumvent the island completely or pass through the mainly uncluttered roads less traveled of the mountainous center and flats of the east.