Replying to South America prosepects and possibilities...advice?

i'm enrolling in summer term so i'll only be getting 6 weeks of summer to enjoy during august and september. however, i plan on making the best of this time by taking a trip somewhere. it looking like peru is the plan. i want to add another country so i'm thinking bolivia or costa rica. has anyone been to this part of the world, is there any advice you could possibly lend?

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