Here are my skills:

 

Attack - 70

Strength - 58

Defence - 51

Ranging - 54

Prayer - 47

Magic - 60

Runecrafting - 38

Construction - 69

Hunting - 58

Summoning - 13

Farming - 40

Slayer - 42

Fletching - 50

Crafting - 55

Theiving - 53

Cooking - 66

Firemaking - 51

Fishing - 70

Woodcutting - 67

 

I am returning to Runescape and getting members again. The summer is coming, and I want to earn as much money as possible at the start of it before I get into other stuff. I bolded the skills I figured would matter the most. I don't care if it's grinding on rocks or peacefully fishing, I just want to make the max amount of money I can. Thanks =D

Killing chaos druids wouldn't be too bad. Though you'd have to contend with a lot of botters depending when and where you do it.

I'd get my rc up to 44 on fire runes, via duel ring, then craft nats for an handsome profit, via the abyss if your time on members is short, via ghraakh if it isn't/you want to gain summon levels.

 

Fishing monks could also be good.

 

If you'd like to fight then I guess chaos druids could be a good place to.

There's a couple things you can do to earn money without really trying-

1. Farm herbs. Toadflax are pretty good at the moment. Just use supercompost, plant herbs in all your patches, and run back and check them later. You'll rake in a nice bit of cash with minimal effort.

2. Do the quests kingdom of miscellania and royal trouble, and use your kingdom to make money for you. Put 10 workers on herbs, and 5 on either maples or raw fish, and just check your kingdom about once a week to get your approval rating back up to 100% and put some money in the coffers (try to keep around 1.3m in there if you're only checking once a week). With this, you can easily make a mil or two a week without any effort at all, possibly even more.