Those buses are totally touristic, safe and they have an assistant on board to help you during the trip.  Unlike the public buses this TOURISTIC bus won´t drive off without you.   Itinerary 12: 40 p.m. Meeting time in the  office in Copacabana village.   01: 00 p.m. Departure from Copacabana to La Paz.  05: 00 p.m. Arrival to La Paz city. (Main Bus station).  Remember: Passanger wil be ready at the office 30 minutes before departure time (1:00 pm).  Meeting point is at "16 Julio" Avenue and "Busch Avenue" corner. VICUÑA TRAVEL OFFICE  Inside the bus there is one assistant who help you with your baggages and cross tiquina straight (1 hour from Copacabana).