Make yourself a Slug Pub.
(Are you ready for Blue Peter? 
)
You need a huge fizzy-drink bottle, plastic colander or sieve smaller than the diameter of the bottle, a pair of scissors, and a can of beer. (No double-sided sticky-tape required!)
Cut the bottom 4-6" of the bottle off, and sink it in the earth up to the rim. Cut the top 6" or so of the bottle off - keep the lid on - and cut 5 or so large chunks out of the bottm edge. You need to make them wide enough for a snail to get through easily, and about twice as high. Fill the bottom part with beer, put the strainer in it and put the lid on top with the handle of the strainer poking through one of the holes. Press the lid down to fix it well into the ground, so that enthusiastic animals don't knock it over.
These work in all weathers, except for heavy frost. They work best if they are dark, but you don't need to paint them (unless you're feeling very Blue Peter-ish), just pile some leaves over. Check every week or so and tip the contents of the strainer on the ground - birds and hedgehogs love it. Top up the beer whenever necessary. IIRC, one Pub will deal with about 10 sq metres.