If you've taken to sea the answer, then press the title and observe it below.

I'm on the vessel on the sea,

To clear me you must move quickly

But lounge, relax upon my chair

Don't sit but you may lay right there,

Or stand binoculars in hand

Observing me observing land.

'I would also never go to sea.'
'Whyever not?'
'I hate the water.'
'But you went with the Owl.'

Riddle Answer A Deck

Riddle Explanation
I'm on the vessel on the sea - a ship's deck.

to clear me you must move quickly - to clear the deck or get out the way and prepare for action.

but lounge, relax upon my chair don't sit but you may lay right there - a deckchair.

or stand binoculars in hand observing me observing land - an observation deck.