Turbo itself doesn't have a lot to offer, and it's primary interest to travellers is its role as the place to get a boat to Capurganá, from where it is possible to get a boat to Puerto Obaldia in Panama.
The city itself has a population of just under 50,000, so there a fair bit going on if you do decide to spend a few days here. There is a main plaza in the centre of Turbo, and most of the shops and restaurants are within a few minutes walk of the plaza.
More information on Turbo can be found on the city's government website: http://www.turbo-antioquia.gov.co/
Turbo is on the Pan-American highway, and there are regular buses here from Medellin. The ride from Medellin takes about 7 hours, but beware as the road is one of the worst main highways in Colombia, with frequent breaks in it due to landslides and much of it untarmaced.
Boats to Turbo depart from Capurganá, further along the coast.
Turbo has a beach (admitedly, not a particularly nice one), about 15 minutes walk from the main plaza, crossing over a concrete bridge that affords a nice view of the surrounding mangrove swamps. If you don´t fancy the walk, there is a bus service, or you can get a taxi or motorcycle.
In addition to the above, there are a range of cheap hotels, just opposite the docks where the boats leave from.
The docks where the boats leave from, is situated just over the bridge from the main plaza. Tickets for the boats go on sale from about 6pm, with boats leaving up until just before midday; it´s advisable to get a ticket as early as possible to be certain of getting a place however.