Most hospitals provide basic birth classes, but I would skip those and take something more substantial that really prepares you for laboring and birth the way YOU want to do it (not the hospital's way). Especially if you want to be able to make informed choices about your options and advocate for yourself, and ESPECIALLY if you have any desire to to have all or part of it be a natural experience.
There are basically three popular approaches. I did tons of research and talked to tons of people before choosing, including some midwives who'd seen it all, so I'll give you my take:
Bradley, Hypnobirthing, and Birthing from Within. Different people like all of these, and their different approaches speak to different people, of course. They will all teach you some of the same things, but have some differences in how they suggest you manage the pain of labor and birthing. Bradley is mostly about breathing. Hypnobirthing is mostly about learning to be in a very relaxed state, and Birthing from Within is about finding your creativity and giving you lots of tools to choose from. (these are really simplified descriptions, but no room to write the books here :).
I know people who have loved all of these methods. Bradley works extremely well for some people. So does Hypnobirthing. Both produce some beautiful births. But I talked to plenty of women who have really struggled with birth after both of those programs as well. Many women feel that if they "do it right" they can have a pain-free (or nearly pain-free) labor - which ends up being true for some women, but not for others. When their labors are, in fact, painful, they are surprised, disappointed, and experience feelings of inadequacy, guilt, etc. Especially if they end up needing some kind of intervention. I like Birthing from Within because it gives you lots of tools to work with so you can choose what works for YOU (rather than being pigeonholed into something that works great for some women, but not necessarily all women), and it really empowers you to find your strength within and do it how you want (like if you want a natural birth, it will really give you what you need to do that), but also prepares you to have a beautiful birth experience even if things out of your control change it from what you imagined.
That's my take. Good luck making your decision!