people level in cooking because its easy to get 99 in, raises total level, and acheivement capes offer pretty good def bonuses. that being said, cooking does need some areas developed, such as it's guild, but this is unlikely to happen as it is basically a support skill, like firemaking.
its level 65 def, doesnt degrade like barrows, is extrmely rare, the most expenisve armour in the game, generally looks cool :P gratz on getting so much 3rd age btw
rockcrabs are good and easy, and i found that al karid guards are surprisingly fast if you just need a few k xp and you arent really paying attention as you can get three of them on you at once
if you get stuff wiht high range def thats the main thing because of the level 70ish ones. there is a rock in the far corners you can sort of use to safe the second one
theres a few at ape atoll. if you do jungle potion (v easy) and a bit of jungle cleanup you can cut the ones in twai won bwo then send them to the bank via the guy north/westish of there. if you want some i can cut them for you for a small price (100gp per log or something)
make a pic of the right size (i think its 80X80 pixels and 6kb) then click the profile button at the top of the forums and near the bottom you can browse your computer for an avatar. clik the picture you want if it fits.
for herblore my mate bought rannars and made into p pots then sold to get money back but also bought higher level unids and potted them. you can make quite a lot of money liek this i think as well
best range legs then either wizzy for extra mage def or iron/khazard for extra mellee def i spose maybe proselyte/initiate if you dont mid a few higher skills but im not sure of their def requirement.
if you could have one skill instantly at level 99 what skill would it be? and why? i would have crafting because it woudl mean i could make all my friends good armours and ammys