Hello,I know this question is often asked. But I haven't found my answer yet in all the post that I have read. We will be in Drake Bay and Corcovado for 4 days in early april. We have hiking boots for the trails but I wander if our Speedo water shoes that we use for snorkeling and walking in water will do the job? To get out of the boat at La Sirena, I guess they are ok; but i am wandering if we can cross the rivers with those shoes? If they do the job, we will save some money in not buying shoes like the Keenes, or the Vibram. Any advice will be appreciated because we will start our CR shopping very soon and also, we want to pack as light as possible.