No real warning, since Berchtesgaden is a very safe town by any standard. You can walk safely in the daytime as well as at night. Beware of the traffic passing the train station though as you cannot be sure if the cars will stop and let you pass.
Make your 1st stop in St.Bartholomae, before you continue to Salet ! Especially on a sunny day with thousands of tourists going mainly to St. Bartholomae it might make sense to stop first in St.Batholomae and continue the roundtrip to Salet and Obersee from there : All ships will go first to St. Batholomae, drop some passengers there and go on to Salet .
In order to continue your cruise to Salet,you will have a completely seperate line and counter than the majority of people, queuing up for returning to Schoenau.
It took me 30 minutes to queue up and get the ship back, in the same time there were just a very few people in the other line and I could easily have taken the ship to Salet and back to Schoenau in that same time...
The ships from Schoenau to St.Bartholomae take about 35 minutes, from St.Bartholomae to Salet it takes 20 minutes one way. the return-ticket is 11 euros / 14 euros.
There are also cheaper combination-ticets with Jennerbahn !
As long as you just take a little walk in the back of Kehlsteinhaus you certainly dont need any special mountain-equipment, some ordinary shoes will be enough. Also the path from Obersalzberg to the upper parking and from there to Kehlsteinhaus (when you want to avoid the golden elevator) is asphalted and easy to walk on.
Just in case that you plan to hike in the steep cliffs behind the panorama-points of Kehlsteinhaus, you really need good mountain-shoes, these steps and rocks are quite steep, dangerous and slippery. These paths were built for the soldiers who had to defend the area in WW II and I saw many tourists trying to walk there in high heels and ordinary shoes, but they returned quickly after a few steps...
I think this pretty much says it all... This is not me in this picture but let it be said that boys from the South should not be allowed to endanger the lives of others on ski slopes!
Falling down a mountain! If you don't like heights (see exhibit A - photo of Greg, white faced and sweaty hands, trying to deal with the higher altitude) - avoid the ski-lift!