I dont usually review on here much, but you do really need to know what you are getting yourself in for with this trek, so thought I would share my experience. Please note that the tour companies really dont tell you how difficult this trek can be because really, if they did, so many tourists would say no!! I am a fairly fit person, I mountain bike and paddle regulary and have good aerobic fitness. I found the trek quite strenuous and had V sore legs for about 4 days afterwards, BUT dont let this put you off, if you go prepared you should be fine.
Firstly the mountain IS NOT open tll the dry season, April 1st till Nov I think, so check this first.
Secondly, there is more that one approach to the Base Camp, which then you generally camp at then attempt the summit at 2AM in the morning. This is because you get up to the summit before dawn when the MT is hopefully clearest of cloud.
I did the 2 day 1 night trek. From the Northern side straight up to the base camp, camp overnight then next day do the summit at 2am, then have brekky at base camp, then descend. This was good, no mucking around for three or 4 days, all done in 2. BUT it is two pretty full on days.
As far as trekking companies go, they charge all sorts of crazy prices if you want a bit of LUXURY, down to as low as $100 for the 2 day trek, which is what we ended up paying. It included all our transfers, hotel one night, all porters and camping and guiding and food. Really, its the same experience for all, you pay alot more more fancier food and a thicker matress.
OK, so awesome experience, just beware it is REALLY cold up the top, you will need a warm jacket and gloves ( you can rent them from trekking mobs), and a beanie would help. MAKE sure you have comfy shoes, I was really happy I had my well worn in runner shoes. They did the trick. Also bring a good torch, some snaks, and some loo paper.
Mt Rinjani, awesome, but it is a little trashed with rubbish they just kick off the side of the hills, and in the next few years they will have to get some sort of sanitary system going up there too! But that will be another story.
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