For a first-timer to South & Central America, what would you suggest to a 22 year old male who'll be travelling solo on a low budget? He will have approx. a month in S.A. & a month in C.A. In C.A. he is interested in Nicaragua, Panama, Costa Rica, Belize. (Although personally I think it's better to pick less countries and see them well). The idea would be to choose back-packers hostels where they arrange trips. The months he would be travelling are August/September. Could anyone please suggest a starting point to plan this trip? Thank you, gracias!