MOSQUITOS!!! If you are sensitive to mosquito bites, call the park rangers for an update before you make the drive. The dunes are amazing, but the mosquitos were so thick it made camping miserable. 5 minutes out of the car and i already had 15 bites! Kids that had been there a day or two looked like they were suffering from chicken pox. We were there at the end of June. Best to hit this park at a less buggy time of year. The observatory is really neat, try and be there on a friday or saturday night for one of their programs, but be forewarned, they leave the doors open, and the observatory is just steps away from a mosquito incubator (i.e. a swamp).