We're booked for the Hidden Galapagos Tour in 2025 and I was wondering if the use of personal floatation vests is allowed for deep water snorkeling. I am not a strong swimmer but have enjoyed wonderful snorkeling in many locations while using a personal flotation vest - most recently at the great Barrier Reef. I can bring my own if needed but I wasn't sure if they would be allowed. I've heard the waters can be rough and may be quite cold but the snorkeling is amazing. Any thoughts?