Hello, I will be going to Cascais in September and I have a few questions about the free bike hires. I hope not to have to worry about this, but I would also like to be prepared for worst case scenarios. In particular, I did not find their policy on what happens if you do not return the bikes on time. Is there a fine? Do they keep your ID or a deposit when you're signing the bikes out? This question is particularly relevant, since I'm also wondering if the bikes can be returned to a different location than the one from which they were rented.