First you can get a bus from the town to the falls it's no 120.
You have two options for doing the boat trip one for R$ 140 which is two hours and one for R$ 80 which is one hour (not for the faint hearted as lots of narrow steps), both trips your in the boat for 20 minutes.
The falls are amazing, the only downside, is that they park could do with signs explaining plants and animals in the area, and also interesting facts as you walk around.
Food, drink and gifts are premium price, bring your own food and drink, also bring a change of clothing and towel to dry off. A water proof mac won't cut it on the boat, swim wear is best. A rain mac might be ok at the devils throat, we didn't have anything and we dried quickly.
Good walking shoes are needed trainers etc, flip flops just won't cut it.
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