We go there to relax as well as to keep fit.

as well as 连接两个相同成分【to relax 和 to keep （不定式）】
as well as 译为：不仅有.而且有.
句子翻译：我们去那里不仅放松身体,而且保持健康
to relax 和 to keep 两个不定式作目的状语
as well as连词