Not knowing the assignment's guidelines or what class the essay is for, please take the following with a grain of salt or two. Also please know that these remarks are intended to spark thought they are not to tell you that what you've written is wrong, because it is not.
Regarding Style:
The journal/diary style that is employed in the essay works, but seems rushed. This might be necessary if there is a word limit.
However, if there is no limit on words, here is something to think about; is it a journal you are obligated to keep only to satisfy a class requirement? Or is it a diary for yourself so that you can look back and remember what you saw, how you felt, and your first impressions?
Regarding Content:
Did you need a respite from Spanish or to return to the comfort of your first language? Just a matter of spinning positive or not-so-positive.
The use of the word inkling; did they have a limited understanding of English or did they only speak a smattering of the language?
Referring to your brother and sister, one guesses that they are your host relatives, but you do not say this explicitly. Perhaps a bit more description when you are '...directed towards our host family...' might be helpful.
Example: "I was introduced to the people who would be my family for the next six days; a 16 year-old brother, Carlos, who seemed ready to burst with excitement; a younger sister, Maria, who was 12 and looked at me with timid interest; and my father..."
Being whisked away sounds like it was an uncomfortable experience, was it? Or, was it just to describe how it occurred?
Example: "It happened so fast I felt like I was being whisked away into this new culture that until now I had viewed from a careful distance."
When you mention learning much, perhaps you could cite an example or two.
Why do you want to move there? You describe the look of the village and it does sound lovely, but why does that suit you?
Is the Spanish spoken in Peru the same as in Spain? Either way, it might be interesting to point out.
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Hope this helps some, in a constructive way.
~L