Metaldehyde can kill your cute little pet dog or your neighbors annoying barking dog. I would avoid using Metaldehyde.
The beer trap and/or the beer/yeast trap is the best way to go (in my experience).
Some believe that using coffee grounds will cause snails to dine elsewhere.
Many people spread crushed egg shells but I wonder how this can help since the snails can travel easily across the shells apparently with no discomfort.
As soon as you can, clean the yard and garden and get rid of weeds and other moist places where the snails can hang out.
Do what you can to encourage toads to live in your garden. Toads eat snails.
Also, many birds eat snails. Encourage the birds to populate your yard and garden. Some birds require a large, flat stone to crack the shells, so keep a bird bath and have a large flat stone somewhere nearby.
Other than that I would pick them one at a time and either relocate them or donate them to someone who can use them as food for their toads or birds. I think I read somewhere that if you relocate snails it must be at least 250 yards away...who does these studies to get answers like that?
