I like using a bug bivy ... open air or under a tarp. My favorite is from Bearpaw Wilderness Designs. REI's bug-hut I is a close second. The Bearpaw WD version merges tub and mesh so there's no need for a separate ground sheet and, zipped, has no gaps for bugs to get in through. The REI unit has a bit more room overhead but isn't integrated with a floor so you need a ground sheet and it is possible to squirm off the ground sheet during the night.
I try to avoid bug spray as much as possible. For me it's the third layer added only after the first two fail. First one is some sort of mesh .. the bug bivy at night or a mesh hat / jacket / gloves during the day, then fog (Thermacell), and finally something with DEET after all else has failed.
Tom
