On five (5) trips to Brazil, I have been mugged once (Salvador, 2001) and robbed twice.
Both robberies occurred in Manaus.
In 1998, at the Tropical Manaus, I forgot I had a bracelet and a pendant, both with semi-precious stones, in my shaving kit. They were gone when I arrived at my next destination, the Refugio Ecological Caiman outside Campo Grande. I should have put them in my in-room safe.
In 2008, I spent a night in the Tropical Manaus Business Hotel. After a tiring experience at and returning from a jungle lodge, I neglected to put into my in-room safe an envelope containing US$200 in cash, my parking ticket for a vehicle I'd left in a San Francisco lot, and, most disturbingly, my house key. The envelope was, instead, in a zipped-up pocket in my Coach briefcase. I was on a plane from Manaus to Rio de Janeiro when I discovered the envelope was missing.
I cannot urge visitors to Brazil strongly enough: put anything you have either in your in-room safe or in the hotel's main safe. Not especially in Manaus, but everywhere in Brazil (and most other countries).
in fact this is a non-danger tip:) i know that some people have doubts and questions- do they have to get vaccination or not when travelling to Amazon river? especially against the yellow fever? and what about malaria?? do we have to buy pills? well.. i studied that problem and talked to "experts"and i can tell you no danger at all regarding malaria..looks like Amazon river waters have a higher lever of acidity and when it evaporates it's unbearable for mosquitos-easy like that! that's why no mosquitos and following no malaria in the region..snakes are more dangerous...
Arriving at the airport in Manaus you are likely to be approached by helpful friendly people who will offer to guide you to a hotel or tour agency. They may claim to be official guides and offer to set up your whole visit. To go with one of them violates an important rule for safe travel: select your own informants and friends. You do not need these people to find the many well established agencies. I heard a number of horror stories related to experiences innocent tourists suffered in their hands. Still, some of the established agencies will pay a "finders fee" to whoever can drag a potential client into their office. In the end you pay for a service that you do not need and you are likely to be taken to the agency that will pay the most rather than the agency that will do the best job.
The Amazon is full of creatures some (like me) find fascinating and others find scary. In addition to all kinds of bugs, the worst of which are probably the mosquitoes and fire ants, there are several species of tarantula and poisonous snake. In six days in the jungle, I was fortunate enough to see three species of tarantula and several poisonous snakes. The snakes really came out after a long, steady rain. One of the guides also brought back a very large Boa Constrictor that he caught crossing the road.
there is a danger of snakes, in the bungalo you are not taking big risks (they put some poison underneath..), but if you are going for a walk alone even not so far in the nearby forest..taking some risks.. one of the guys from our group did it...and thanks God he stayed alive, they had enough time to take him to local hospital...
This warning actually applies to lots of cities in developing countries, but in Belem I actually encountered four major examples of the common side walk dangers within several blocks of each other. The first was a 2 foot verticle drop without steps going from in front of one store to in front of another. The second was a broken irregular sidewalk surface change that was very slippery. The third was a at head level obstruction sticking out of the wall. And the fourth, was a completely missing manhole cover with no warning.
With all the things you have to look for including traffic, people, and dogs, and all the things that might attract you touristic attention, do not forget to watch where you walk. I have seen many variations of these dangers and tripped on quite a few, but so far no broken ankles or black eyes.
Someone I was travelling with had a gold necklace ripped off their neck in broad daylight walking along the main road in the town of Manaus. Dont wear jewellery or anything that makes you stand out as 'well-off ' - grunge down, as a tourist you are being watched carefully anyway .