If you dont have a jetpack then dont worry, you can still find sky islands, its just going ti take a but longer then if you had a jetpack.
WHAT YOU NEED
[li]100+ ladders[/li][li]50-100+ blocks (dirt,sand, anyhing you can dig up fast)[/li][li]50+ torches[/li][li]A fur coat (Its cold up there)[/li][li]Food [/li][li]A basket(s)[/li][li]A spade or some sort of weapon[/li][li]Armour[/li][/ul]
The first step is to find a spot where the sky is unexplored and start placing ladders.To make your ladders last longer get rid of every second ladder.Dont worry you can still climb up it.Do that until the sky gets dark.Some people (like me) Have found an island or two already, but some of us haven’t yet.
The second part into finding islands without a jet pack is too find a spot about half way or three quarters up your ladder and take the blocks you have and start placing then right or left.It may work and it may not it depends in how you do it.I used an island to start it, if you haven’t found an island yet then you may have to go back to the ground and build a block tower to start.and like we did with the ladders, to make your amount of blocks last longer then take out every second block.
You may also want to put torches on some of the blocks so you can see better.
Now afer you have your long road of blocks what I like to do it place ladders going down.And like we did before, take out every second ladders so that it lasts longer.
Now the weapon, armour, and food can be worth it any time, mostlh when you find a sandy island.They usually have a catus and a scorpian (If you dont know what a scorpian is, its a green animal that when you get close to it or harm it it will tey to kill you by shooting out poison at you) Using a spade or a weapon instead of your hand makes it take more damage, and kill it quicker.
This is what I have explored in my world in the past two or three days.
[U]TIPS FOR DOING THIS[/U]
Make sure you always have food
Make sure you sleep often
Make sure you place torches- it makes your blockhead move faster
Also there are sometimes special island woth something called a Gem Tree.Dont cut them down though!They will spawn gems!A red tree is a ruby tree, green is emreald, purple is amethyst, blue is saphire. They are really rare and hard to find!
Feel free to post pictures of what you have found on islands, od even post some other ways to find islands without a jetpack!