計画通りに　as planed/according to plan

Traveling/Life does not go exactly as planed. 

Things aren't going according to plan.

That's what's fun about it/This is the point.

大人になる　grow as a person/become an adult

Travel experience and learning makes/helps us grow as a person.

That's what it means to become an adult.

Accommodation budget is not so generous.

according　adv)...によって･（計画、規則）に従って

generous　ジェﾈﾗｽ　adj)気前のよい･惜しまない･太っ腹な