From Potsdam Main station ("Hauptbahnhof") take bus line 695 to stop "Orangerie".
Just a few meters to the east you will find the buildings of the Maulbeerallee.
You may also take the S-Bahn or a train to Potsdam main station (Hauptbahnhof). The train RE1 also stops at station "Park Sanssouci". From there take the bus (see above).
From Potsdam city centre follow road signs to Sanssouci Palace. Pass Sanssouci Palace and carry on along the Maulbeerallee. Behind the Orangerie forecourt you will find the entrance on the lefthand side
Staring from Potsdam/Eiche or from University Campus at the New Palace ('Neues Palais') follow road signs to Sanssouci Palace. Shortly behind the bus stop "Drachenhaus" you will find the buildings 1 - 3 and the greenhouses of the botanical garden.
Take a flight to any Berlin Airport (Tegel, Schönefeld).
From Airport Berlin-Tegel take bus line 109 to the S-Bahn station 'Charlottenburg' or alternatively take bus line X9 to train station 'Zoologischer Garten'. Then take S-Bahn S7 to Potsdam main station (Hauptbahnhof). In Potsdam use the bus (line 695, see above).
From Airport Berlin-Schönefeld take the S-Bahn S9 to Berlin 'Friedrichstraße'. Then change to S-Bahn S7 or to train RE1 to Potsdam main station (Hauptbahnhof). You may also take a train from the Airport directly to Potsdam. In Potsdam use the bus (line 695, see above).