The two hour bus ride from Puerto Jimenez was actually a truck with benches in the back. I thought I was back in Haiti. The reason for the truck is that we had to ford a number of rivers to get out to Crarte. The 6 hour hike into Sirena Ranger station was partly on the soft sand of the beach and part up and down cliffs and part of the time up and down steep ravines. We forded a number of creeks and rivers - one up to my waist. To find the trail as it went from the beach up to the jungle and then back to the beach would have been difficult with out a guide. And with out a guide I would not have seen one tenth of the wildlife that I did see. You don't need expensive hiking boots. My $18 Walmart boot did just find including hiking all day with them in the water. When it was raining, even the jungle trails were rivers. The $10 Walmart FrogToggs rain poncho was the best money I ever spent. I'm turning 70 this year and made the trip without any problems. However, there are guides and then there are guides. Mine was the best as he knew where to find the animals. Other guides knew the trail but that was about it. It was an incredible trip. If you are not up to the hike physically, then you take the boat from Drake Bay.