I've have been eaten to a bloody pulp by those darn Buffalo Gnats! They are NOT deterred at all by Deet.
When I did some research the vanilla sprays seemed to be a favorite.
By the way...the Mississippi River is STILL at flood stage! It looks like maybe by next weekend it might get down to an 11' stage....the highest I will go out in. The Minnesota Boat Harbor is a muddy mess, and probably won't be usable until July. The river crested at 17.6 feet, the highest (by far) in the 12 years I've lived here. The river has been in major flood stage since about March. The poor folks down river have a long a long time to go before they will see "normal"!