Radio Island is a fun dive if the vis is good 5-10'. Dive at slack high tide. Look on a tide chart for Duke Marine Lab or Piver's Island for an accurate tide time. You can get an easy 1 hr dive. By the end of May, Discovery Diving will offer ferry service over to RI. It's just as easy to walk your gear down to the fence. RI County Beach Park has fresh water showers. Water temps should be in the mid 70's. Macro photography is good. Nudibranchs can be found by the keen-eyed diver.
To dive RI. When the tide time is correct, start at the fence, walk out, place fins on, swim underwater to start of jetty in 5-7' of water to start your descent. swim into the current by turning right, work your way up and down the rocks. ALWAYS KEEP THE ROCKS OFF YOUR SHOULDER depending if you're swimming up or down the jetty. Do not swim off the rocks into the channel. Boat traffic can be heavy on weekends, and divers have no place surfacing in the channel! Even if you have a flag! Stay On The Jetty!
Anyway, swim into the current, then turn around and swim the opposite direction working up and down the rocks. Take a flashlight to look for octopi and other creatures living on the jetty, Please do not take any live shells. Collect all the free fishing lures and weights you want.
To leave the jetty, swim up to the high part of the jetty, but don't surface there, cross the rocks and swim inland until you reach shallower water. It's safer than surfacing at the rocks which are close to the waterway. Use your dive flag!!
A night dive at Radio Island is a unique experience too. Especially during a full moon!
Have Fun!