I live here in Sarasota and can vouch for Gulf Coast Model RR shop in Sarasota at 3222 Clark Rd, Sarasota, FL 34231
Phone:(941) 923-9303. It's a great store - Kelly and Dave will take good care of you.
The model railroad club in Sarasota/Bradenton area,
http://realrail.org/ is great place, some very talented modelers there such as Bob Hamm, NMRA National Contest Chair, Ray Hazen, and more. They're open house every Saturday from 10-2. The folks there are some really talented modelers. I used to be a member there before my job got too busy again.
If you are able to drive to Cocoa Beach (Cape Canaveral area) on Jan 7-9, that will *really* be a highlight of your visit to the area, it's
the "Winter NMRA Nationals"
http://www.prototyperails.com/ Don't miss this one if it fits your sched. Definitely on your bucket list.
Sunshine Region of NMRA lists a lot of good info.
http://sunshineregion.org/SunshineRegionHome.aspxH&R is just OK. Haven't found any good other hobby stores in Tampa area. Many people from Tampa will drive down to Sarasota if they want a good model railroad hobby shop. Take the wife to St. Armand's Circle for shopping/eating, then stop by on the way to Gulf Coast Model RR shop.
The Suncoast Model RR club in Largo is definitely worth a visit:
http://www.suncoastmrrc.com/ 12355 62nd St, Largo, FL 33773
North of Tampa is the Suncoast Center for Fine Scale Modeling I hear is just great:
http://www.finescalemodeling.org/Welcome.html *Incredibly superb* modeling here. The Suncoast Center for Fine Scale Modeling, Home of the Sundance Central Railroad is open on the 3rd Saturday of the month. Open from September thru May and CLOSED June, July and August. 2016 3rd Saturday Hours of Operation: 10am till 4pm
Willaford Railroad Museum in Plant City (about 26 miles east of Tampa is a good visit):
http://www.willafordrailroadmuseum.com/ There's also a model RR club in the same town. Plant City is good railfanning.
Florida Railroad Museum in Parrish, FL (on east side of Tampa Bay) is here:
http://www.frrm.org/Tampa Union Station, if you're downtown, is worth dropping by for a few minutes to look around.
Hope that helps!
John Sing
ATSF_Arizona
www.pbase.com/atsf_arizona