Weather in the park can change quickly, so visitors should always bring raingear, a jacket, sunscreen and plenty of water when enjoying the park. The park is an active geologic area, and while the chances of a surprise eruption are low, rockfalls, floods and mudslides are unpredictable and visitors should take care when hiking in valleys and along streams. If a rumbling sound is heard while hiking, or if the water level begins to rise, find higher ground immediately.
Wildlife is generally not dangerous, but common sense should always be used. Give animals their space - keep at least thirty yards from bears, but also remember that elk and other animals can be just as dangerous. A general rule of thumb is that if an animal is reacting to your presence, you are too close. Never feed any wildlife - it is bad for the animal, and will make that animal more aggressive towards humans. Do not leave scented items in your car as they may attract bears; food, deodorants, toothpaste, and other items should all be stored in bear-proof containers.
When hiking on the mountain, know your limits and do not venture onto glaciers. Seemingly solid ground often hides deep crevasses in the glaciers, making hiking dangerous. Travel on Rainier's glaciers should be attempted only by those familiar with glacier travel or those accompanied by an experienced guide.
fees/permits
Mount Rainier National Park charges an entrance fee of $15 per week per private vehicle includes all passengers or $5 per week per individual person on foot, bike, or motorcycle. An annual pass is available for $30, valid for one year from month of purchase does not cover camping fees. Alternately, for those who will be visiting multiple parks, the $80 National Park Pass allows free entrance into all national parks for one year.