Varrock Sewers

The Varrock Sewers is a common place for F2P players for training. Several quests also require you to venture down here, such as Demon Slayer or Rat Catchers. Varrock Sewers can be accessed via a Manhole just west of Varrock Palace or via a Agility Shortcut in the Edgeville Dungeon. The dungeon is like a labyrinth with many different ways to go, some ways leading to dead-ends and others leading to deadly death traps with multiple monsters attacking you.

Just north of the entrance are two women, Phingspet and Grimesquit. They play a role in the Quest Rat Catchers. There is a ladder in an area containing Level 24 Zombies that takes you up into a a small room where a Level 21 Grizzly Bear resides. Inside this room are two coin respawns.

In the Moss Giant section, there is an Agility shortcut pipe which will take you through to Edgeville Dungeon. This requires Level 51 Agility.

There is a river, most probably of waste, that flows throughout much of the sewers where spells can be safely cast at Skeletons. It is a safe way to train magic for new players. Ranged can also be trained, however arrows cannot be retrieved unless you re-obtain them by casting Telekinetic Grab.

Item Respawns & Their Locations
There are many items that respawn in the Varrock Sewers. Here is a list of them and where they respawn...
 * Coins - Entrance to the Sewers near Level 3 and 6 Giant Rats. There is another respawn of coins in the area inhabited by Level 34 Deadly Red Spiders.
 * Mind Rune - Respawns in the area inhabited by Level 24 Zombies.
 * Body Rune - Respawns in the area inhabited by Level 24 Zombies.
 * Knife - Respawns in a small room guarded by Level 27 Giant Spiders.
 * Red Spiders' Eggs - Respawns in the large room where Level 34 Deadly Red Spiders reside.
 * Iron Axe - Respawns in between the small areas where the Level 42 Moss Giants inhabit.

Music Unlocked

 * ScapeCave - This isn't exactly unlocked as you actually unlock it while doing the Mining Stage of Tutorial Island.

Monsters

 * Moss Giants (Level 42)
 * Deadly Red Spider (Level 34)
 * Giant Spiders (Level 2 & 27)
 * Skeletons (Level 21 & 25)
 * Ghosts (Level 19)
 * Scorpions (Level 14)
 * Zombies (Level 13 & 24)

Traveling into certain parts of this dungeon requires slashing webs using a weapon. There is a respawn of Red Spiders' Eggs in the large chamber at the end. Red Spiders' Eggs are used in the Herblore skill and also used as an ingredient for the F2P Strength Potion.