This is a great way to meet people as you will have a pre-organized group. They also help with transportation.
You should have offline maps downloaded, an offline translator, a power bank, and an idea of what you want to do! Looking lost can be dangerous.
Don't sleep on public transit, don't drink too much, and don't wear headphones walking around.
A great way to calm your loved ones about your solo travel, is to share your itinerary or location with them. This way someone will know approximately where you should be and when