Mate, Olive (channel owner) is a girl's name. Probably not the right person to ask. I've stayed at Flipper Lodge many times. In answer to your question, yes it's guest friendly. You'll get no weird looks or questions. It's totally fine and normal. No extra fee.
We need someone who works in the hotel or was there recently. What is it like at the hotel if you want to go to Koh Larn Island as a couple? How much does it cost from the hotel and how quickly does it go?