If you had a Sony, it probaly came with whatever weird Sony only memory like their current memory stick. Therfor you need more memory than came with the G2. You need at least 340 meg for a trip like that, unless you have a laptop and means of downloading a smaller capacity flash card/microdrive. As far as flash goes, stick with what you have. My indoor shots are as good as my film camera, Nikon F4S and top of the line Speedlight. I find 99% of most peoples indoor shots are snaps shots anyway. Spend your hard earned money on memory, the flash is in no way a must have at all. Get a Lensmate and sky filter, mainly for protection of the zooming lens, it also gives you something to hold on to like a regular 35 mm camera. I can't recomend a telephoto lens to you, they don't exist for this camera. I have the so called definitive lens, the Olympus B300, not worth the money, you can't use the viewfinder with it, therefor when its sunny out you have to use the then almost impossible to see LCD screen. If you want long telephoto shots, you need a film camera with some big glass on it. I usually take my Nikon along and leave the B300 at home. The G2 is a wonderful camera, I use it exclusively until I need those long shots. Canon has let us all down by not designing a useable telephoto for this fabulous little camera. Banff and Jasper are incredible places to visit, bit commercial these days but what place is'nt now? The natural beauty is out of this world, almost too much to take in. Good luck....