For the best idea of what is being seen, it's always best to consult ebird.org. Then go to Explore and then Hotspots.
You can type in Hunter Island or Turtle Cove or wherever you want to go. A list will come up giving you the name of the person who was there last, and what they saw. If you're not a member of ebird, it's great to sign up. It's a free service that keeps a record of everything you saw as long as you're diligent about submitting results. You'll also be doing your part for Citizen Science. This is a free service.
Here's what seems to be around in the park, it's what I saw in the last few days:
In and around Turtle Cove:
week beginning 5/26 to now
Warling Vireo (H)
Black-crowned Night Heron
Virginia Rail (Brendan Keogh at Turtle Cove)
Baltimore Orioles are nesting now.