Is World Adventures worth buying?

Another yes from me and I don't even use the actually tomb-raiding bits that much. As many have said both nectar-making and martial arts skills are super fun, as are the CAst items. Lastly, I also recommend getting the Traveler mod, in addition to what others have said it can also turn any town you have saved into a vacation destination, which is super fun. What are you waiting for? You should definitely get it!