Translation of glaubwürdig

In the beginning it looked brutal but it worked. He brought my wallet back to me and asked me to count the bills in it. I was stunned and could not believe what just happened. He repeated his order.
We left on time and the route included some nice beach towns along the coast, such as Tulum and Playa del Carmen. Behind me sat two very cute girls who started to talk to me about life in my country.
I made plans to visit a surfing contest with a girl that I have met on the first day. We agreed to meet at ten in the morning at her place. I couldn't keep my eyes open and decided to quit.