Nicaragua
El Castillo is small town on the Rio San Juan. Getting there is quite a trek but it is peaceful (there are no cars) and the area is stunningly beautiful. The hotel was basic but clean and comfortable and I have great memories of relaxing in a hammock on the terrace to escape the hot afternoons. I went on a guided trek through the jungle and it was truly like being in another world. A definite highlight of two months travelling through Central America!
From the boat dock turn left down the main road, go past the church and it is a couple of minutes further along on the right hand side.
Google map: bit.ly/JjcTtm
The largest most pristine rain forest in Central America.
Take a boat from San Carlos and journey a few hours down the river, stay at on of the riverside lodges.
The wildlife is too diverse to list in full but you'll almost certainly see monkeys, sloths, crocodiles, caimans and perhaps manatees.