I am shooting a kids fishing event in the beginning of August. Last year I shot the same event but at the time had no off camera flash options. While many pics came out well with just natural light, many could have used so fill to give them a bit more pop. The event is on a dock and will be during mid day. Last year it was overcast which helped, but I want to be prepared in case its not. These will be mostly impromptu type portrait shots, walking about and snapping away while the kids fish. I was wondering if anyone has a recommendation for a diffuser for something like this. The flash will most likely be hand held, using cybersyncs or an ETTL cord. This is not a paid gig so the parents are just happy to have the pics, but I am hoping to use this as practice for me. And most likely I will not have an assistant. Thanks.