ascending and descending, climbing and coming back down (particularly as of a person or thing travelling or moving up and down, such as stairs or levels)

to ascend and descend, to climb and come back down (particularly as of a person or thing travelling or moving up and down, such as stairs or levels)

climbing up and climbing down (particularly as of a person or path travelling or moving up and down, such as a road going uphill and downhill in the mountains)

to climb up and climb down / to go upstream and downstream (such as on a river, or on a highway with “up” indicating towards a city)

river

river, stream, brook

field trip

a honeymoon (trip taken by a newlywed married couple)

travelogue

travel agency