Hey Carolyn,
Thanks for your feedback and we are sorry to hear that you feel like you did not have the best experience possible on your recent Contiki. We do offer different travel styles depending how you like to travel but we are working on making it clearer for future travelers and particularly for Central America.
With regards to the tour blocks, we do try to make people aware that some trips are modular - like yours - and also that Travel agents consult our customers about this to make sure they get the most out of their experience. If there is anything else you'd like to add, please don't hesitate to shoot us through our homepage. Thanks!