A little off topic, but when I was in Anacortes the Harbormaster's office loaned out bicycles. It made me wonder how many other places had loaner bikes in the harbor? For me it was a complete blessing and some of the bikes had racks and baskets for hauling your stuff... My boat is small enough having a bicycle on board would be problematic, and the salt exposure would make upkeep hard.
For keeping the up, especially in salt water.... hose them down with fresh water and occasionally spray all the metal parts with Boeshield.