YOU SAID:

we should go hiking in the mountains

INTO JAPANESE

山でハイキングに行くべきです

BACK INTO ENGLISH

Should go hiking in the mountains

INTO JAPANESE

山でハイキングに行く必要があります

BACK INTO ENGLISH

Must go hiking in the mountains

INTO JAPANESE

山でハイキングに行かなければなりません

BACK INTO ENGLISH

I have to go hiking in the mountains

INTO JAPANESE

私は山でハイキングに行かなければなりません

BACK INTO ENGLISH

I have to go hiking in the mountains