One day we rented some bikes from MacBike to go to Waterland. We would recommend splurging for the handbrake bikes instead of the footbrake ones. We also got the insurance for a couple extra euro, but it wasn't necessary (thankfully). The staff at MacBike was very friendly and helpful. The price was also very reasonable.
Just a note of caution... riding bikes in Amsterdam city centre on the way to the Ferry was pretty intimidating with cars, pedestrians, motorcycles and other bikes to be on the lookout for at all times. The experience was definitely worth it, but it is not as easy as it looks. read more