Dinner Key Marina is now the principal city of Miami Marina pleasure craft facility. It sits in the heart of the Coconut Grove community, and there are lots of restaurants and shopping within walking distance. Security might be a concern in Coconut Grove, however, after dark.
I notice Captains John and Susan do not say anything below about the shower/bathroom facilities here. We have always found these unit sub-par!

We enjoyed Dinner Key Marina. Had no problems finding the slip. The Piers were well marked on the ends and each slip has the number on its dock box. We didn’t have any help on the way in, but we didn’t ask. Saw several dock hands helping others who asked, though. On the way out, a line handler showed from the Marina and several volunteers were there as well. We had great dinners and thoroughly enjoyed the walking and Coconut Grove area.
John and Susan

Hi,
We live in Miami and have kept our boat at Dinner Key Marina for about a year now and have had no problem with security at any hour and we have had some very late nights, we walk to and from the bars, shops and restaurants at all hours of the day or night and never had a problem.
The bathrooms are in very good condition. The showers are in just good condition. Most important is that they are cleaned daily.
We are very happy with this marina and the overall location is excellent. Everything you need / want is within walking distance.
Jules Robinson

On Sunday, July 11th we did not want to run all day since we wanted to celebrate my birthday. South of downtown Miami and south of the Rickenbacher Causeway, we found the long, privately marked, channel into Dinner Key Marina. 6-feet was the least depth I noticed in the channel. We have stayed here numerous times. It is a huge facility with a diverse and fun liveaboard community. Restaurants on the water are just north of the marina. The funky-artsy village of Coconut Grove is a short walk to the southwest of the marina. After dinner on the boat, we went to a dueling piano bar to continue my birthday celebration. We paid $2.50 a foot per night plus electricity. They hold a $25 deposit for each gate/restroom key you want. This is a city marina (its sister marina is Bayside in downtown Miami). The restrooms here are always questionable. They seemed better maintained this visit, but they are old and could use a refurbishment.
Jeff and Michele Prahm aboard MV Java Girl

Click Here To View the Cruisers’ Net’s Florida Keys Marina Directory Listing For Dinner Key Marina