I would do my best to avoid the wasps and have a plan of action, if one of them does get stung. Here's a very informative article that tells you how to treat bee stings and wasp stings. I would have the necessary items (vinegar for wasps, baking soda for bees, benadryl, tweezers (bees), etc. on hand and easily accessible.
http://lowchensaustralia.com/health/bites3.htm