Welcome to the Tampa Bay are Marcelo.
Alafia is hands down the more technically demanding trails of our three Tampa Bay are trail systems, with Gator Back and Moonscape requiring the most skill. There is also a pretty tough section on Rock Garden as well. Roller Coaster is labeled a black diamond, but just has a few bigger drops than the intermediate trails. Alafia has a great set up, with a very nice restrooms, bike wash, vending machines and the trail head is centrally located to all the trails there.
Balm Boyette's trails are more geared toward speed, with great flowing hill sections in both North and South Abyss, and in my opinion, nothing beats Ridgeline for fast, flowing fun. The intermediate trails also flow great, especially Spiderberm heading out - and the faster you go, the more fun it is. Drawback to these trails is really no amenities, (just a port o let) and the 2 mile double track out and back is a turn off to some. If you do go, a map is highly recommended. Maps can be downloaded to all three Swamp parks here on Swamp Club.
Wilderness Trail System in north Tampa has a lot of different trails and the loop through out is about 15-16 miles of single track. Great amenities at the trail head here as well, but the trails do not offer much challenges, with no climbs or drops of any size to speak of. If you want to get miles in with a lot of roots, this is your place.
Santos is an awesome trail system, just about an hour and a half drive north of Tampa.
Hope you enjoy your riding here!