"We are going to Vancouver in August. I was wondering, what things are there to see and do in the rockies?"
Vancouver is about 1000 km, or a full day's drive, from the Rockies, and there are a few other mountain ranges to cross in the process. But don't feel bad -- Eastern Canadians often get this wrong, including the Toronto-based Globe & Mail newspaper (which is inexcusable -- but that's another story).
There are dozens of places in Greater Vancouver where you can rent an RV
if you're going to make the trip. If you like to hike, there are national and provincial parks along the entire route, and in and around Vancouver as well. Bring hiking boots; running shoes won't do it. And warm clothes; I've been snowed on big-time more than once in August in the Rockies.
Skiing is somewhat more problematic in August, although not impossible. You can get in some glacier skiing with a guided tour, probably at great cost. Your best bet for this might be Whistler, which is only 2 hours drive north of Vancouver -- but the Rockies also has lots of scope, and the elevations are much higher. Horseback riding is widespread throughout the province and in the Rockies.
A google search will pull up all kinds of info -- but if it's really the Rockies you're after go to the National Parks website and get to Banff, Jasper, Waterton. Look at Glacier and Mt. Revelstoke as well -- they're in the Purcell Mts -- not the Rockies but close, and just as spectacular.
Here's the national parks link:
And here's the B.C. parks link, also useful:
Have a good trip. If you've got lots of energy, there's no place better in the world to get into the wilderness on foot.
Never let the facts get in the way of a good story.