Hi again - I'm not sure how I missed this thread yesterday, so thanks for the PM that made me go looking for it. I think I'll answer here rather than by PM, for the possible benefit of others.
I have never camped at Berg Lake CG, always either Rearguard or Robson Pass (and that was many years ago). I am making plans to go in again with friends this summer (maybe I'll see you because we are also looking at late August ... we will be a group of three or four Jasperites), and we are thinking about Rearguard again.
One thing I recall from our last stay at Rearguard, and I have also heard of this happening at Berg Lake CG ... one of my friends had her hiking boots chewed on while she slept; she had left them in her tent vestibule. So put those babies *inside* your tent at night!
I have never had this experience, but have been told that sometimes, when Mt. Robson is in condition for climbing, there are all sorts of climbers who camp on the flats rights near Rearguard ('cause it's the CG closest to access to the glacier & climbing route (I think they use the Snowbird Pass trail to start) ... and would be using the facilties there & making it much more busy/crowded. The campground is actually just in the trees, and the climber's overflow is in the open, on the gravel flats.
I have only hiked once to Adolphus and it was after a long day of hiking in really miserable weather and with lots of mosquitoes, so my recollection of it is not that favourable. ;-) If I recall correctly, it's quite non-descript as a lake, at least compared to Berg (muddy bottom, no turquoise water, no tumbling glaciers and icebergs, and the surrounding peaks are much less dramatic).
Regarding Moose Pass - I have never done this route, but hiked last summer with someone who has. From what I understand, there is a fair bit of route-finding and river crossings involved with the Moose River route (on the other side of the pass); it is not a well-used trail, possibly not maintained any more. But I don't know what the Calumet Creek side of the pass is like. I would suggest contacting the Jasper National Park trail office for more info (contact info on JNP website:
www.pc.gc.ca/eng/pn-np/ab/jasper/contact.aspx Or, you might try the forum at www.clubtread.com - much more likely to be someone there who can give you details (maybe there's even a trip report with photos) ... I had a quick peek and didn't see anything, but there was one thread that talked about the Calumet Creek/upper Smoky River valley being prime grizzly bear habitat.
Regarding your itinerary, on day 4, I would suggest hiking to Rearguard BC, then on day 5, I would suggest doing Snowbird Pass as a day hike, returning to your camp at Rearguard. (One less day you'll have to take down and set up your camp). Then on day six, hike all the way out - it's basically level from Rearguard to Berg Lake, so just a bit of extra distance that day, no extra hills.
Hope this helps, and that you'll come back and post a trip report.... I'd especially love to know how the Moose Pass part is.