The saint johns river is the longest river in florida at 310 miles for its entire length the river only drops about 30 feet creating a number of lakes and sloughs to explore the launch point for this tour is a pubic boat ramp where you will be able to explore several creeks and hidden cuts during your 4 hour trip along the way you will stop for a chance todoa little hiking we commonly see numerous birds including the american bald eagle blue herons osprey hawks egrets and ibis