We are going on the Island Princess to the Panama Canal on 1/26/08 and looking for suggestions for shore excursions for Puerto Quetzal, Guatemala and Puerto Corinto, Nicaragua. Are these places that we could feel safe to get off the ship and go into town on our own?? The tours available thru Princess are not anything we would be interested in. Also, are there excursions offered thru Princess that would not be listed on their website but are available once we are in port.??