Slugs and snails can be a real problem for many gardeners. You never get rid of them, you just control them. NEVERsmash a snail. They often have eggs inside their shell and snails are not he's or she's, but "its."
They often carry up to 100 eggs, and so smashing one helps launch dozens more! They also like cool, moist places to hide like under dead grass, leaves, brush, or mulch that is piled up near the garden.
Getting rid of these snail and slug breeding areas will help keep the population down. For more info and a great link from the USU Extension article on slugs and snails, go to: http://extension.usu.edu/saltlake/htm/faq/faq_q=260"
Potato bugs are usually not a problem. Slugs, snails, earwigs, aphids and thrips are.