Bali trip

8 days in Bali/Indonesia — what should I add or remove?

Planning an 8-day trip from Oct 30 to Nov 7/8 with my 13-year-old son.

Currently thinking of:

• Batur/Kintamani
• Ubud
• Nusa Penida
• Gili Air

We like adventure + nature + beaches — interested in Batur sunrise trek, snorkelling, scuba diving, short cycling, hiking, waterfalls and possibly surfing.

We are relatively slow travellers, so I don't want to make the itinerary too hectic.

Questions:

1. Is Batur + Ubud + Nusa Penida + Gili Air too much for 8 days?
2. Which place would you remove, if any?
3. Is there anything important/fun that I should add instead?
4. Is Gili Air worth visiting if we're already doing Nusa Penida?
5. What would be the best route/order for these places?
6. How is early November for this itinerary?

Would love suggestions from people who have done a similar trip, especially travelling with a teenager.