Changes

This is probably a much better one than the first option. Take bus number 40, 48, 59, 67 or free "Avion bus" (not sure if the free Avion bus stops at stops while going to the shopping center) and get off at Hněvkovského. Walk in the same direction the bus was going (if you took the bus from the city center) and you will pass a cross with traffic lights. Just there is a 15 meters place for cars to stop where you can hitchhike and cars will be coming slow enough to stop. The road directly goes to Bratislava and average waiting time is less than half an hour. There is a petrol station 150 meters away if you need anything.