Mosquitoes definitely, black flies probably. One really cannot tell until a couple of weeks before the visit, as far as how bad a mosquito season it will be. Suffice to say that you should start researching best bug sprays and bug candles while finding out if your camp has screens on the windows (can't imagine it doesn't). Eat lots of garlic the week before, take B Vitamins and wash your clothes in smelly detergent and Bounce. No fruity shampoos or natural-scent soaps.