All rentals come with complimentary use of a lock and helmet. So no need to bring those.
Dress for the weather. We have ponchos available for rainy days, as well as bikes with fenders. Also try to wear sensible shoes.
Rentals require a credit plus a piece of government issued ID (driver’s license, passport). If you don’t have a credit card you’ll need to bring a piece of government issued ID and a deposit of $50 per bike (cash or debit).