Lunar Diplomacy
400 exp.
75 exp each.
The Smithing Quest
920 each
A lot of quest give you exp lamps. You can also check the reward of the quest before you start it.
In RuneScape, I assume. Cast any spell; that will give you magic experience. There is no easy shortcut, if that's what you mean; you'll just have to cast lots of spells. One way to do this is through magic combat.
Pyres can be used in a mini-game for prayer and fire exp also if burned gives more exp than the original log of it's type.
Try Imp Catcher. Its the simplest one.
Runescape Accursed Urns give a bonus experience of 375 exp. To fill the urn you have to have the urn in your inventory and kill lesser or greater demons. The ashes will automatically go into the urn, and can be teleported when full.
You get 50 mining experience for every coal you mine.
50 Fishing XP 77 Cooking XP