It depends on the individual if you’re prone to motion sickness you could, they do have tablets onboard to help if you’re prone to it or start to feel it. My tour nobody was sick.

Weather was rough we had the flexibility to leave after the big boats they reported the Only 2 mantas we’re sighted at 30 metres down so we didn’t bother to snorkel at Manta bay went to a more protected area north side after lunch we drove to the bay and walked around the point we were advised not to swim in the pool as waves had swept 3 tourists out to sea last week great tour guide as a freak wave came in just minutes later hence my recommendation cheers

Yes you can booking private boat from “Nusa Penida by Private boat Snorkeling” high recomended. No extra cost from them you just ask need private tour or join with other(public).. They also provide yacht but lil bit more expansive.. They also provide wine or beer or alcohol in the boat if you request to celebrate or just fun..

Ours was a private tour only for us. Pls check with nusapenida.one the operator directly.