Don't feel like you have to fit in everything you have read about or researched on this trip. As you said, this is your FIRST cruise... not only cruise... not last cruise. Take a deep breath and relax, have a great time. Let yourself get comfortable acepting there will be a "next time" and decide which things you will add to the list of to-do's for your next cruise so this one is as wonderful as possible. Have a great time!!