My boyfriend and I will be in Tanzania in August, and are trying to decide whether to spend 4-5 days in Pemba or Mafia. We are primarily invested in snorkeling (not diving- we aren't certified!) and island exploring. Beaches are nice, but we don't want to just lounge. Which island would be better for those types of activities? Another consideration is that we'd like to be as far away from the tourist/party scene as possible… Any insight or travel tips for either is appreciated!