Mos Le'Harmless is initially travelled to by talking to Bill Teach aboard the eastern most boat at Port Phasmatys docks. Alternatively, a charter ship may be used from any port with trader crew members. This may only be attempted after starting the "Cabin Fever" quest. Bill Teach will not appear on the docks of Port Phasmatys until the quest is started and the option to travel to Mos Le'Harmless from charter ships will not be available.
You may also teleport there using the fairy ring code DIP, after completing Fairy Tale III - Orks Rift (see below). You need to repair the bridges with 8 planks (plain planks, not oak, teak, mahogany, nor protean planks), 16 nails and a hammer for the first time or else you can't get on the island. One bridge must be repaired while standing on the small island, the other bridge MUST be repaired when standing on the main island. It is a little difficult to find the repair spot on the bridge. Just search around where planks are sticking out and it should give you the option to "repair the broken bridge." Alternatively, just use the planks on the bridge.
Notable features
Trouble Brewing - A competitive minigame in which two teams brew 'rum'.
The jungle outside the gates- Contains jungle horrors and snakes that are stronger than the common poisonous variety and that always drop a snake hide.
Charter Ship - Transports the player to various docks and ports around Runescape for a fee.
Patchy - Sews together various items of clothing, such as a pirate hat and an eyepatch, for a fee of 500gp. (Eyepatches are not sold in the clothes shop, but they can be bought from the charter ship's general store.)
West of the entrance to the Mos Le'Harmless Caves there is a black slab with a carving of a black mask on it. If anything besides a chisel is used on the slab the player receives the message "Something sinister happens a long way off. But, for all intents and purposes, nothing interesting happens." A chisel can be used on the slab to get rock fragments, which can be used to feed an ex-ex-parrot.
During Fairytale III - Orks Rift, a player will gain access to K'Chunk's island just south of Mos Le'Harmless' south coast, but the bridges to the main island are broken. After the quest, the player can repair the bridges. This requires 8 regular planks, 16 nails of any type, and a hammer. Use fairy ring DIP to go to the islands, go to the first bridge, and use a plank on the broken part of the bridge. It is repaired, using four planks and eight nails. The other bridge must be repaired from the Mos Le'Harmless side. Go to Mos Le'Harmless, go to the second bridge and then use a plank on the broken part of the bridge. The second bridge will be repaired, using up four planks and eight nails. Fairy ring DIP and the bridges are convenient access to the town on Mos Le'Harmless, and they are also convenient to get to the Mos Le'Harmless Caves and somewhat useful to get to Trouble Brewing.
Monsters
The swamp, found to the north of the island, is home to giant mosquitos, jungle horrors, snakes, and crabs.
Mos Le'Harmless is featured as an Arcanists arena.
The patch notes update on 4 August2010 completely nerfed the rarity of high level impling spawns on Mos Le'Harmless. Previously, the island was a popular place for impling hunters because of the respawn points that commonly produced implings ranging from nature to kingly.
The only accessible part of Mos Le'Harmless used to be the town, which was surrounded in Unknown, but after an update the entire sea around it, the jungle, Harmony Island and the Trouble Brewing minigame became accessible.
