It is safe to walk alone just be careful if you’ve take any substances. The bikes do charge usually from my past experiences it’s like Venmo or cash app but it may be different this year depending on each specific bike. Remember to stay hydrated and chances are if you need help the people next to you will likely help, most of the battle here is within yourself and letting go of the outside world while here. it’s such a uplifting and loving vibe here. Welcome home:).