Depends on what's around me. But I'd start out by talking to myself. That's how it always starts. Observe your surroundings, make sure there is food around, clean water is available. Then focus on a place to stay, safety. After that, fishing for fun. Making a little boat would be entertaining, nothing big, just to go around the area. But as a hobby there? I would probably play with my hair, gather shells, improve the place, carve a pipe and flute, etc. There is always plenty to do, no matter where you are.
I am not one who is generally given to amusements, but my first order of business would be to pray and seek an audience from the Most High. I am always strengthened through prayer and God's presence comforts me.
After I have prayed, I would look over my surroundings and prayerfully consider the best course of action to take.
with or without my laptop? When I was about eight years old, pre computer days, my brother died and it wacked me out so that I could no longer communicate with other kids for a couple of years and had to fill my time alone. Weekends were horrible. A laptop would have been just the thing...