Simplify the following text for a Grade 13 native English-speaking person.
Original: Guests climb aboard an open-sided safari vehicle for an expedition to see numerous African animals freely roam through acres of savanna , rivers and rocky hills , including reticulated giraffes , hippos , African elephants and lions .
Simplified: Guests board an open-sided safari vehicle for a trip to see African animals freely roam through acres of savanna , rivers and rocky hills , including giraffes , hippos , African elephants and lions .