Hiring bicycles in Taipei

We are coming to Taiwan for 3 1/2 weeks:

  1. Where is a good place to hire bicycles for adults and kids in Taipei? Also - as my son has only just learned to ride - is is possible to hire an adult bike with a trailer?
  2. Assuming I can’t borrow a scooter from a friend, where is a good place to hire scooters from?