You can still do ape atoll you dont have to accept the rewards you dont even have to finish it. I think he has completed the quest by not yet claim the xp from the dude that gets him to ape atoll. Of I'm not wrong you can get an evil tree at ape atoll and you can go there. Edit:
Not really, for dark beast I unlocked it after I started bit of MEP2. where i get the new key and moved in little more for the cut scene. Not sure for the others though.
Along with Green Dragons/Avs you can: Do herb run (About 80k per run, every 75 mins, takes 5 mins to do). Buy battle staff from Zaff everyday with varrock armour. ( 1k profit per battle staff) Do MTK. ( About 100k per day)
Rune Defender > Book More accurate, hit higher, more defense. Less prayer but the altar is on top : Also if you are getting hit too much get a verac skirt.
Near the astral temple there is this 'house' where 2 suqah spawns near each other, stand about the north east tip of the house (beside the anchor), and its very afkable. \ Wear melee armour and 10% prayer if you want.