The correct answer is 'Visit five or more booths within one hour to collect stamps.' The announcement states that to get the souvenir (an original eco-bag), one must collect stamps from five or more booths. The exchange time for the souvenir is until 3 PM each day. Since the person arrives at 2 PM, they must complete the stamp rally and exchange it within that one-hour window. Bringing their own chopsticks gives a discount on food but is not a requirement for the souvenir. Trying on ethnic costumes is free but limited to once per person and is unrelated to the souvenir. Going to the exchange counter by 4 PM is too late, as the exchange closes at 3 PM.