...ya shouldn't have a problem taking a nap on the shoreline so-long as you don't pitch a tent

. .. ...if anyone asks ya, you're just taking a break, not sleeping

......and it's not like you'll be anywhere close to a residence so I wouldn't worry about that. (Edited: you might not want to be seen getting off the ferry with Tent supplies, I don't think that's appreciated out there...it's like taking a step back in time once on the island....and you pitching a tent might appear to be lost revenue to the watching natives)...not to mention, you'll be basically walking right thru the middle of town to get where you're going...so you won't go un-noticed.
DaveS brought a Large back pack, Superdufflesized......he was hurtin'

,, ...
Just a few things to mention in regards to
1- Night Commando Trips... for those who haven't been -
When the Ferry drops you off, you've got NO WHERE to go. There's no bar/restaurant/hangout area....NADA. You're on foot with all your gear...and it's probably way to early to start fishing, AND... you want to disappear so you don't look like a moron to the natives. You'll want to know exactly where you'd like to start fishing and head in that direction. Once there, make yourself comfortable, find your markers/the better spots to access where you want to fish, & where you'll potentially land the fish...and scout around the area before night fall. GO THERE WITH A GAME PLAN. Don't get there and try to figure out what to do, you'll spend a lot of time walking around and getting tired, and with a long night ahead of you, you'll want to conserve your energy. Check the forecast, if it rains, what will you do? There's no where to hide from it.., (legally). If you're looking to catch the morning Ferry, plan your fishing around being back in time....otherwise, you'll have MANY HOURS of sitting on an empty dock....once again, looking like a moron who didn't plan accordingly.
There's probably a write-up somewhere on here on how to pack for a commando trip...

....but I'm not a big fan of the "Search" engine.....so you'll have to dig it up on your own. It will only take you one trip to figure out how to pack and fish it for the next time.
I highly recommend doing a group trip BEFORE a commando trip....for your 1st time.
Good Luck!!!