Who did contestants have to perform in front of in order to receive their next clue ?
Airdate : December 2 , 2012 Amsterdam ( Amsterdam Airport Schiphol ) to Barcelona , Spain ( Barcelona – El Prat Airport ) Barcelona ( Port of Barcelona ) to Palma , Mallorca ( Port de Palma / Puerto de Palma de Mallorca ) Dalt Murada , Palma ( Palma Cathedral ) Manacor ( Centro de Alto Rendimiento ) Campanet ( Coves de Campanet / Cuevas de Campanet ) Sa Pobla ( Windmill ) " or " Muro ( Plaza de Toros la Monumental ) Palma ( Bellver Castle ) In this Leg 's Roadblock , one team member had to return 20 tennis balls fired by an automatic server within the bounds of a clay court in order to receive their next clue .