I was in Greece with my friends over the summer. We visited Athens, Santorini, and Rhodes. Athens has its beautiful monuments, but the place I loved the most was Santorini. It's a "jewel" -- beautiful. I would love to go back. I recommend this island to all who are able to go. 

     There is no need to use "really," "lovely," "awesome," and also remember the difference in use between the words: "come" and "go". When we speak, we use unnecessary adjectives, adverbs, and other linking words as filler; to help us think, or to create a pause. In collegiate writing we should attempt to be concise and succinct. Save the "flowery" language for prose and creative writing. Good work expressing yourself in English, Ana. 

It sounds great! I just fixed the punctuation and turned "i" into "I".

This summer I was in Greece with some friends. We visited Athens, Santorini, and Rhodes. Athens has beautiful monuments, but what I loved most was Santorini ("what" is not wrong, but I would suggest saying "the place I loved most" because it sounds more natural). It's a jewel. It's really beautiful and lovely. I would love to come back. So if you can go there I really recommend you this awesome island.