Besides the well known tourist destinations in Yangon like Shwedagon and other popular temples, there are other activities which are also very nice, a lot of fun, provide a lot of opportunity to watch the local people and very photogenic.

These include a stroll in the market in China Town, a ride with the Circular Train and probably a little less well known: taking the ferry across the Yangon River to Dala.

The ferry takes only about 10 minutes to Dala, but in the short time, you are experiencing a lot of amazing things and frantic activities around and in the boat (before and after boarding) . The ferry is practically always chock-full with passangers and vendors selling snacks, fruit, bread, eggs etc. and people taking all kinds of things incl. chickens etc. from one side to the other side of the Yangon River.

The boats, which are quite large (2 levels) and having a capacity of certainly hundreds of people, departs about 3 times per hour. Tourists have to buy the tickets at a separate office room (USD 2 one way, much higher than tickets for locals, but nevertheless still very affordable ...).

After boarding you can sit or walk around. Obviously there are no reserved seats.. 
Ideal for people watching and taking pictures.

At the other side of Yangon River, in Dala, you can make a nice round tour using a tricycle (about Kyat 3-4000 / person), visiting a pagoda and riding pass relatively quiet  villages. 

All in all, a very nice experience if you have 2 - 3 hours to spare in Yangon.