You are in Bear Country and remember it is you who is the visitor here. If you see a bear, which we didn't, all sightings must be reported to park staff so they can monitor the bears movement. Regular bear reports are posted at visitor's centres and you will not be allowed to walk solo or in two's but in organised bigger groups.
When you get near the base of the falls watch your camera lens. The mist is very thick at times and the wind can blow it right at you. Not that it would damage your camera, but it may ruin your shot. Another thing to watch out for on the hike to the base is the constant flow of people. This is one of the largest tourist attractions in the park so it is always busy.
I thought I had driven on switchback before .... but apparently I hadn't! This section of Yoho Valley rd was amazingly intimidating - especially with 2 cars in opposite directions!
There are signs leading up to it was warning, and trailers aren't allowed on this road ...... but there was a large F250 in front of me at one point that just couldn't make the turns ...... and had a back out ... (wimp!)
So be cautious, and be aware of your own lmitations as a driver ....