Considering a trip to Alaska for 2009 or 2010. When would be the best time to visit...late May, June, July, August or early September? Would have 2 weeks (fly in to Anchorage) and plan to visit Denali NP, Homer/Seward, Wrangell-St.Elias NP and possibly the arctic circle. Main concern would be for the weather (rainfall/mosquitos/warmer temps/ wildlife viewing)...would like to do some day-hikes. Northern lights would be a big bonus. thanks.