Yes, activities are optional. You can stay onboard and relax

You can not add more places to go but can skip any of them

do you think the tour is still worth it?

If that’s what you’re looking for, then it’s definitely worth it! there's a big difference between a day cruise and an overnight stay.

On most day tours, once the crowd heads to the places, the boat pulls away to a nearby anchor point. To save energy, they often shut down the generator (meaning no AC or lights, fans). But if you book a luxury boat, you don't have to worry about that. You can just chill on the sundeck, hit the jacuzzi, or grab a drink at the bar.

If you go with an overnight cruise, it's even better. You can just retreat to your private cabin, hang out on your balcony, or enjoy the bar whenever you want

That makes sense. Thank you guys