Ocosingo is a city in Chiapas.
There are urban colectivo's, but the city is small enough that it is best to walk. If you are coming from Comitan, you will get dropped off by the farmers market, which is also the point to catch a colectivo for the ruins. Ask directions for the central park to find most of the hotels, restaurants, atms etc. There is a different terminal for colectivo´s for Palenque and San Cristobal.
For most, Ocosingo is only a jumping off point for Laguna Miramar or Toniná. However, if you do decide to stay here, the town is friendly and0 not a bad place to stay a night. The centre has a leafy colonial style plaza, and near the colectivo terminal is the rowdy "peasents" market, where local farmers come to sell their produce.
The obvious attraction here are the ruins. There are also Automatic Teller Machines (ATM) in Ocosingo. Before heading into Laguna Miramar you should pull out any needed cash here. If you stay here a day, take a stroll around the central plaza in the evening or explore the farmers market in the morning.
If you are coming from San Cristobal or heading to Palenque, here is a good place to buy handicrafts at cheaper rates than you'll likely get elsewhere.
There are a number of decent hotels off the main plaza that are priced between $15 and $30 USD. Budget travelers beware, at the time of writing, apparenlty there are no dormotories in town. For solo travelers, you might find it difficult to find anything cheaper than M$180. You could always arrive early, see the ruins, and then continue to San Cristobal or Palenque. Factor around 3 hours to see the ruins and the museum.