The fourth Repeatable Militia Side Quest you can get is given to you by Mika The Militia who can be found In the Warrior Guild Tower near the Western Britain Bridge.
Mika asks you to slay some Lizardmen. This is a great quest to get some Spined Leather while you hunt.
Once you have accepted this quest, you can do a couple things. You can hunt throughout the lands for random lizardmen. or you can head over to Felucca Despise and head upstairs. There are a bunch of Lizardmen that roam this room. Kill 100 and then head back to Mika.
Now that you have killed the 100 Lizardmen, collect your 2000 Gold and 2700 Experience Points daily!