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Medellin: Is 7 days (excluding travel) too much time in just Medellin?
7 days is not too much time in just Medellin, however, you should really get to know Cartagena.
Colombia: Is it a good idea to rent a car in Colombia?
I don't really know the cost of renting a car in Colombia but gas is really expensive despite the diminishing cost of petroleum.. about $4.5 dollars per gallon.
Cartagena: Beach spot accommodation around Cartagena
Barú is a beautiful Island in Cartagena (about one hour away from the city driving or on small boats) the beach is extremely beautiful and very clean. You could try the Decameron Cartagena hotel which has great rooms and an amazing...