Okay, this is a simple tree swing which is really easy to build, even if you don't have any hardware tool at home like me.
Step 2: Get the Materials
Manila rope is very durable and is usually used for fishing net and scouting rope. Chengal is a kind of hardwood tree found in Southeast Asia, especially in Malaysia, Singapore and Thailand. This is the wikipedia entry about chengal tree in Malay. Can't find one in English. May be you can use Google Translate if you wish to read it.
Besides helping me to cut the chengal plank into the size I want (Dimension = 24" x 10" x 1 5/8"), they also helped me to drill the 4 holes (Diameter = 6/8") at the corners of the wood for the rope to pass through.
So at the end of my hardware shopping trip, I got these:
1. chengal wood = 24" x 10" x 1 5/8" (which is surface finished & drilled)
2. braided manila rope = 1kg (for 8 ft. tall branch)