I agree that you can be close to God in nature, but don’t forget that in Divine Liturgy (or Mass), God is actually present there in the Eucharist, in a unique way

not like anywhere else. It’s not the fellowship, it’s not the people, or the building, but the Eucharist…
but certainly there’s nothing wrong with spending time outside in nature to pray too
God bless!
This is how I think of it.
In nature we experience the presence of God. (This seems undeniable to me, simply from having spent time in nature.)
At the Liturgy we experience God Himself, under the appearances of bread and wine.
Sacramentally, nature is an ikon, while the Eucharist is that which the ikon represents (and makes present, though not substantially). However, there is a sense in which the Christian mystery is less veiled in the ikon of the Divine Liturgy than in the ikon of nature, because the Liturgy reflects more visibly the divine Logos, through its iconography, the liturgical action, and the music. Nature thus seems more akin to the silence forming the background to the created Logos (=Word) of the Liturgy.
Therefore, the Liturgy is by nature communal, focuses on the adoration and glorification of God, and is only participated in by the sanctified (i.e., one can’t receive Holy Communion in the state of mortal sin), while nature is by nature (pardon the bad pun) contemplative and a place eminently suited for repentance and metanoia. Hence Christ retreated into the wilderness for the prototypal Lent, and John the Baptist and Elijah (both being, as prophets, types of Christ) retreated into the wilderness - and the scapegoat was sent into the wilderness. Nature is a sanctuary for repentance not only because it (like man) is fallen, but probably because repentance itself is simply a form of contemplation or silence (as Max Picard used the term) suited to fallen man.
Therefore, “love of nature leads to love of man” (Wordsworth).
And because of the presence of God in nature, being in nature leads to a sense of peace (a false sense, unless it corresponds to a real repentance within the soul).
This is why one can feel sentiments expressed in the beautiful poem shared with us above.
Whence comes, O God, this peace which floods over me?
Whence comes this faith with which my heart overflows?
To me who, not long ago, uncertain, restless,
And tossed on waves of doubt by every wind,
Sought the good, the true, in the dreams of worldly sages
And peace in hearts resounding with tempests?
Scarcely have a few days brushed past my brow,
And it seems that a century and a world have passed away,
And that, separated from them by an immense abyss,
A new man is reborn and begins again in me.
-Alphonse de Lamartine