Els has covered this site pretty good, but we like to add a few comments. 

First of all, what an adventure to get here! We really enjoyed the drive through wonderful lansdscape, small villages and the river crossings. 
We stayed three nights, two days and did the Grand Tsingy first. 
For the Grand Tsingy, our guide convinced us to do the Grand tour, combining circuit Ranotsara, Broadway and Andamozavaky. It will take about 6-7 hours and almost no one does it. And he was right, we didn’t meet any other people until at the end. The route adds one more viewpoint and a hanging bridge. And as Els explained, we used harness to clip on to safety ropes, up ladders and stepping stones,  climbing our way to the top. I am impressed how they made this marvelous rocky terrain available to «common people». The view from the top is just fantastic. 
Besides the climbing the track is winding through caves,(several places we have to squeeze ourselves through), boulders, rocky terrains and sometimes easy hiking in the forest. We encountered four kinds of lemurs: the Deackens Sifaka, several groups of Red faced Brown Lemurs, Bamboo Lemur and the Red-tailed Sportive Lemur (nocturnal, sleeping on a tree in the afternoon sun). We used in total  7 hours, with plenty of photo stops and a lunch break. 

Day two we did the River Gorge and the Small Tsingy. It was well worth to stay an extra day

When you are there
We had an overnight at Kirindy and did a visit to Kirindy Forest, which turned out to be a nice surprise. We did both a night walk and a morning walk. We encountered all 5 possible lemurs at this time of year. At night, the Grey Mouse Lemur, the Red Tailed Sportive Lemur, Fork marked Lemur. Daytime: Brown Lemur, Verreaux’s Lemur and the Sportive Lemur sleeping on a branch. And as big surprise we also got a closer look at the Fossa. We stayed at Relais du Kirindy, nice place with a pool. 

Practicality 

• we stayed at L'Olympe du Bemaraha, dated, clean, nice pool, great sunset view. You can pay with credit card!
• Mad zebu restaurant in Belo, great place to stop for lunch. Gourmet food as good as you can get in Madagascar to a decent price
• Bring a bag of bon bons , all the kids are asking for it. It will make them 😊
• Bring your empty water bottles, they are happy for them too
• I also gave away small soaps to the women washing clothes
• There were no need for armed escort now