If you want to stay in Bali for longer than 30 days, you're going to want to pay for a Visa on Arrival at the airport. This way, you can put off doing a visa run until after you've been in the country for 60 days instead of 30. Not only am I going to give you the step-by-step process to extend your VoA, I'm also going to give you a few of my "off-the-record" tips for saving time and money on the whole thing.
