Just wanted to post a warning that there are a LOT of sea urchins around Tower Island & SSB right now

You should be fine on the main beaches, but definitely be careful around tower island in the sea grass and close to the rocky cliffs to the right of SSB's beach - I counted 15 in just one small area!

One person stepped on one while we were there and had to go to the nurse and get antibiotics ($65+ just for the medication plus 1/2 a vacation day ruined!)

Fortunately the water was pretty clear so it was pretty easy to avoid them, but be aware that they are around.

Most water shoes should protect you, but I wouldn't take the chance of trying it out...