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Visitors should not expect to rely on the bus sytem for the neighbor islands, though there are plenty of shuttles and trolleys to most tourist attractions. Taxis are plentiful, but not inexpensive. Oahu is the most developed, and the easiest to travel using public transportation. Adult fare is $2.50 which includes one transfer, Seniors (65yrs.) 1.00 per ride or $5 a month , (requires a $10 senior bus pass card available from the bus office), and a 4 day pass for visitors is $35.00.
TheBus for more information regarding time tables and routes. They have a map available with bus routes to get to specific destinations ( such as Pearl Harbor or the zoo).