This is honestly one of the most beautiful and mesmerising places I've ever been - I found myself (and other tour members) just standing and staring at the sites in awe uncountable times during the four day tour. Oxalis made the trip even more so memorable: their professionalism made me feel as safe as can be, and their eye for quality was suberb (oh my god the food...).
We hesitated at first to book the tour as it is quite pricey, however we don't regret even an inch that we did it in the end. This is definitely a trip I'll still talk about for many years to come. Anyone out there who is hesitating: put it at the top of your list and just do it!
Note though that this tour needs to be pre-booked online, it is not (yet?) available for last-minute booking in Phong Nha.
The Oxalis packing list was quite helpful, I was very happy with my smartwool socks and salomon speedcross shoes, which had a good grip on the often very slippery rocks. Quick drying clothes are a must and will make your trip all the more comfortable. Other things I was happy to have with me was my sweatband to keep the sweat out of my eyes, and the card games we brought to enjoy the cave camping evenings with fellow group members.
Beforehand, I was slightly worried that the hot climate would be an issue for me - knowing that I get overheated and dehydrated easily in hot tropical weather. I filled my 1-l water bottle each morning with ORS powder to keep hydrated well which was very helpful, and luckily inside the cave the temperature dropped somewhat to a more agreeable level. The physical activity itself was not an issue for any of our tour members; I think that with reasonable fitness and relatively strong legs the tour is very doable. We trained with a few multiday mountain tracks over two months prior to the tour and this was sufficient for us. The most strenuous activity of the whole tour I'd say is climbing the great wall at the end, however this is quite doable too since it requires only about 5-10 minutes of your strength ;-).
Ah man just writing this review makes me want to go again!
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