I carry a set of the mesh tops/bottoms. Have used them more than once. I treat them with Permethrin before a trip. I believe this will help with the mosquito's, at least better than untreated ones.

MP mentioned the wide brim hat with Permethrin vs a baseball cap.
I use a combo of the two. I wear nylon mesh ventilated baseball cap, with a sun cape I made out of a Bug Off brand handkerchief. I sewed a button on one corner, and a small elastic ring like the ladies use to tie up their ponytails. I wear it like a doo-rag. Then put the hat on. The cape keeps the sun and bugs out of my neck and ears, and protects the top of my head if a bug gets thru the hats mesh areas. I treat all my exterior clothes with the Permethrin before a trip. Unless your adamant about not using chemicals, you won't be disappointed with it.

I tried the Off Clip on bug device in my recent car camping/fishing trip.  Every night about 1/2 hour after sun went down, the skeeters came out in force for an hour or so. Sitting around fire enjoying a few cold one's, the little battery bug repel-er worked very well. There wasn't a stiff breeze, but since a breeze would of helped with the bugs, I thought it was a good investment. If your sensitive too bug bites, all or a combo of the items mentioned might be the ticket for you.

The extra weight while negligible is off-set by the lighter weight clothes  you need during the really buggy seasons.

For those summer ankle biters in the canoe; I hate to admit it, but this year we actually each resorted to a fly swatter and it seemed to work!  I mean, there were obviously no fewer flies, but the satisfaction of littering the bottom of the boat with fly carcasses somehow made their marauding attacks a bit less 'painful'.  In past years, they would bite and you'd swat with your hand, miss; only to have them return and bite all over again.  Frustration!  Not this year!  They may (or may not) get one bite in and...swat...another one bites the dust!  One thing I did learn though, be sure to clean up the dead bodies and dump them overboard once in awhile, because they seem to attract more friends.  Nothing seems to bring out the curse words more than those ankling biting flies...and they always seem to know when you have a fish on.