The Bora Bora private beach is beautiful but lacking in amenities. They bring some water/soda/juice and some kayaks but that is about it. Very little, if any, seating. Very little, if any, shade. Nice to visit but I would not plan my days around it. Try and get out on the lagoon with one of many fantastic snorkel companies. We love Pure Snorkeling. As a contrast, the private motu at Taha'a is spectacular.
PG used to include the cost of air in their packages. Now that is ala carte but you can purchase the air from them. Price it out as it may not be worthwhile. If you do get their air they do include the transport from the airport to the pier (taxi would be $30) and at the end of the cruise they take you to a hotel for a day room and then bring you to the airport that evening. If you are independent you usually need to get off the ship at around 9 am to 10 am.
All ports are tenders as you asked. Reportedly the PG website has been down for months meaning you would need to call to reserve excursions. You can view the excursions on the website, you just can't book them.
Did you use a TA?? If so, I would contact them.