And should you have level 60 Dungeoneering you can access Taverley resource dungeon; Red dragons - Not really recommended because Red dragons can only be located in 2 areas if I'm not mistaken: Red dragon island in RS gold the Wilderness and Brimhaven dungeon and both are far from a lender; Black dragons - Taverley is crowded everywhere I wouldn't even bother so Zanaris is the very best alternative imo; Metal dragons - Not much to say here, all Metal dragons are at the Brimhaven dungeon (Mithril dragons being the only exception) and are not too hard to kill and also have fairly decent drops; Frost dragons - 85 Dungeoneering required so it's not really an option for you right now unless you feel like coaching Dungeoneering. You can also attempt to create money with Slayer but if you don't get Dragon tasks all of the time I'm pretty sure you'll make more cash just killing Dragons.
What Silv said are pretty good suggestions. When I was your level I'd Experiments. All the way from 60-70 and it took me only like 3 days. It was dull since you don't actually get anything but experience there though. It is kind of weird because I don't remember what I've been doing 70-90. I know I've Chinned a few tasks, umm and completed things like Ranging directors, the Circus. Not to mention Cannon.
In case you don't have a issue with wasting some money you could Cannon Dagannoths while you Range them as well. Or you can Chin, but I do not suggest Chinning til at 80+. Going to Yaks can be good exp/hr. Around 40k at the best currently probably. But that may be pushing it a little. As there are lots of bots there.
I have not tried Fire Giants though. I see a lot of people doing it whenever I had a task of them though. So it must be alright. Aviansies can be a good money maker and okay exp. But I am also afraid like Yaks, they are starting to have lots of robots. Hope I sort of helped. In buy osrs gold paypal about 3 weeks I will have 99 Dungeoneering (6 chaotics). I was wondering - donate myself two years (maxing out etc.) and then moving to a Nexing team w/ specialist equipment, heck, maybe solo if possible, or, give myself one year and receive CLOSE, or, heck, maybe even, maximum out just through doing Frost Dragons, and I would also have an ely following roughly 1 year.