You can visit and Camp within the Park system 2 ways, from the north and from the south. I recommend the south via carate, this route is less exhausting, and as the ranger stations are closer together. If you want to stay at Sirena the largest ranger station in the centre and use that as a base camp for day treks you must book this in advance, you can do this easily at Puerto Jimenez office and the rangers there will show you the route and advise on transport to carate, (cheap n easy) you can sometimes arrange food at sirena /and accommodation. (Not always check first) otherwise you must carry all your food and tent for your stay!! . I must warn you that if you are traveling by yourself, your backpack will be very heavy and the temperatures rarely go below 30 degrees and a lot of the first part of the trek are on deep sand in the full sun! I always use a jungle hammock with built in fly/mosquito net, it is very light and extremely comfy. I can not convey to you enough of just what a special and wonderful place Corcovado park is, its worth the mud, rain, and mosquitoes! If you are feeling adventurous, here is a tip, wade through the shallow stream at sirena at night with a torch and you will see baby caimen, fish-eating bats, and poison dart frogs, maybe even a jungle cat!