Herbalism

You should be able to continue to gather some of the herbs you used to get to 240 like Firebloom or Purple Lotus in places like Tanaris.

Then once you hit 250 you can go into places like Hinterlands and Felwood and get Gromsblood, etc.

The guide on the site is pretty useful in helping you get to 375
http://www.almostgaming.com/wowguides/wow-herbalism-guide-with-maps

If you find anything wrong in that guide post comments on it so it will get updated.