Before you book an accommodation, make sure that you are well researched about the place and the locality it is situated in.
Plan where you want to go, what you want to do, which sights you want to visit and more beforehand. You can always make changes later.
Try and wrap up all your homework before you head for your solo trip. This way, you will be carefree all throughout your vacay.
It's always important to have comfortable clothes and shoes in stock when you know you will be away from home for a longer duration.
Apart from all that you plan to spend, make sure that you have extra cash handy. You can also divide and keep your cash in different bags.