。
I plan to climb Mt. Kita.
Literal
Kita-mountain [to-に] climb [intention-つもり] is.
北岳 ('Mount Kita') is the second-tallest mountain in Japan (after Mt. Fuji), located in the Akaishi Mountains. 登る ('to climb') takes に for the target being climbed. つもり expresses personal intention. An excursion plan statement.