Why Not Trap?
Raccoons are smart. They know that one of them got caught in the trap and they know that by going in, they risk the same. If you're patient, it's likely you'll catch more within a few weeks or months. But you should really reconsider whether relocation is the humane option you assume.
If you release wildlife into a new area, it's often leaving them to starve slowly. At your home, they have a territory they know well. They know where the food is, they know where the shelter is, and because it's familiar, they've got a leg up on keeping other raccoons out. If you put them someplace new, they won't have any of these advantages and will likely starve to death or be killed by predators within a few weeks. And then next year, the raccoons you didn't catch will come right on in and take over where last year's raccoons left off, along with all their kids.
Another Look at the “Humane” Alternative
You don't give your location, but in many places it's illegal to relocate wildlife for the reasons above and it's preferred that you simply kill them rather than try to make them someone else's problem. Check with the local wildlife authority.
Humane alternative to trapping
The best way to deal with raccoons or other pest wildlife is to eliminate their food source. The absolute biggest thing is to not leave your garbage accessible. With raccoons, that can be as simple as a bungee cord across the bin. If they unlatch or chew though that, then look into chaining it closed, buying a locking bin, or put the bins in a shed or garage when not in use.
For your garden, build a fence or try a product such as predator pee to frighten them off. An electric fence is usually effective, a simple barrier fence can work as well as long as it's well constructed.