Difficulty: Moderately Easy
Step1
Evaluate your passions. Find out where your real passions lie. If you are not into hosting dinner parties, then don't register for the traditional flatware of sterling silver or the elegance of high quality china. Register for stainless steel and mass produced pottery settings.
Step2
Research retail organizations that carry your passions. If you are into SCUBA diving and your new spouse wants to join you, then find some place that sells SCUBA gear. If they have a gift registry or at least a website, put it out there. Registries are nice and convenient to help your guests know where to look and what to get that you actually want and will use. Some places may not have registries, but almost everywhere you look you can get a gift certificate.
Step3
Talk with your local stores. Some stores may not have a formal gift registry, but if camping is your passion, your local outdoor shop may manually work up a registry for you. If it will bring them more business, they may be more than happy to go that extra mile.
Step4
Use the super-giant-mega-stores. These discount retail outlets are bound to have something for everyone. Although this is your day, don't be so selfish as to publish a registry that is convenient to only a few. You might expect to get a lot of what you want, but in reality, you'll end up getting a lot of what you didn't want because not everyone likes you enough to go that far out of their way.