Sure. First we used the company Excursiones Kavac http://www.excursioneskavac.com/) for the tour and traveled with Trasmandu from Puerto Ordaz.
We arrived to Canaima at noon in a 6 seats Cessna. At the Canaima ‘airport’ the staff greeted us and took us to the main camp. There we got the instructions to change our clothes for something more suitable for the boat trip and to keep handy 4 things: the camera, the mosquito repellent, sun block lotion and a poncho. We packed a change of clothes and left everything else in their offices. Then we were provided with a light lunch (sandwich and soda) and then took the boat to the base of the Angel Falls. The trip lasted around 3 hours, with 1/2 hour walk in the sabana (easy walk). The views on the trip are amazing, but I will recommend taking some cushion with you (a towel in a plastic bag should be enough). There are a lot of rapids to go thru that could be kind of scary, but these guys are experts! (We always had the lifejackets on). We arrived to our base camp when was already dark, but we were able to see the Angel Falls with the moonlight... amazing!!! We got dinner and we picked a hammock each one (my husband is 6 4"... it was better for him to stretch in two hammocks).
Early in the morning we got breakfast and back to the boat for a very quick ride to the beginning of the trek. The first half is not very difficult, just a few small creeks. The second half it is more challenging. A lot of steps full with big trees roots and rocks.
The hike has a lot of these:
http://www.flickr.com/photos/kodiak-jack/369381818/
http://www.romanvirdi.com/venezuela/2_2958.jpg
About how much to hike, the guide told us that some people do it in 1 hour, but our group took almost 2 hours.
Look at this photo: http://www.flickr.com/photos/22215144@N06/2141028850/ . You can see the distance from the river on the left to the Angel Falls. We did not make it to the base but to a spot where you can see it and take amazing photos.
The way back is easier than going up and it felt it lasted less than going up (of course!).
We had lunch with at the camp and made our way back to Canaima. We got out of the boat earlier than everybody because we wanted to go to Salto El Sapo and Laguna Canaima (we had an early flight the next day). The rest of the group did that trip next day. A nice dinner was waiting for us and we slept the last night in very comfortable beds.
Tips:
For the boat trip take clothes that dry quickly and sandals/flip-flops... you can get very wet especially if you seat at the back of the boat. On the front you can feel all the bumps... It is your choice!
Take your own water for the hike.
Take your own snacks. And if you want to drink alcohol, better buy it before arriving to Canaima, because the price goes really high there!
I’m not in shape, either I trained for the hike, but I was able to make it to enjoy the close view.
Take a good poncho and a flashlight.