One of my favorites for summer grilling is lime juice, honey, olive oil, garlic and cilantro. Marinate for a few for a few hours and baste while grilling. Its simple but I like the fresh taste and the honey caramelizes a bit for a little sweet kick in some bites.
I love cilantro...but I know some people are not fans. Just try not to think of stink bugs while using it! My youngest does not like cilantro just for that reason...