Canada's Banff National Park -- a 2,500-square-mile park in Alberta's Rocky Mountains (about the size of Delaware) -- is a beautiful place, offering lots of things to do. These activities range from skiing to camping to hiking to shopping (in the town). The rules of the park are myriad for the various trails and locations, but in general there are some park rules which should be kept in mind, no matter what activity you're planning.
Obey the speed-limits: park personnel can and will issue tickets.
Cruise-control is not recommended, as it is a good idea to keep your foot on the pedals.
Watch out for slower traffic and wildlife.
If you have a weapon, it must stay in the vehicle, unloaded, and completely covered. Gun-racks are not allowed.
Do not stop in avalanche zones.
All camping requires a permit, and may only be done in designated areas.
Only one tent/camper/shelter per campsite unless authorized.
Campfires must be contained to approved structures such as grills.
No permanent modifications or structures; what you bring in leaves when you do.
Food should be kept in closed containers, and trash disposed of in marked receptacles. This keeps the bears from getting to it.
Pets must be leashed. This keeps them from getting into other people's campsites. (And keeps the bears from getting them.)
Keep your distance. Many of the animals are bigger than you are, and unlikely to play nice, especially the bears.
Do not attempt to feed the animals. This also means keeping your food contained, even if you aren't camping.
Do not challenge the animals, especially the elk, for dominance of the road/path/etc.
Do not get out of your car to take a picture of the elk/bear/etc in the road.
Report all sightings of aggressive animals to the park authorities.
Do not walk on or under overhanging snow or ice.
Keep away from the edge, whatever edge that might be.
Safety signs and fences are there for a reason. Do not ignore them.
Rocks and avalanches are both likely to fall. Be aware of the danger signs for both before hiking/skiing/etc into the back-country.