Jellyfish are strung out all along the water, and even up into what appears to be dry sand for the first 5 feet or so. Out in the water, YouTube had videos showing Cannonball Jellyfish (never heard of them but glad to catch the name).
The type at the end of Johnson Avenue in Cape Canaveral and I know up to Lori Wilson Park are a purple looking jellyfish, 1 to 2 1/2 inches in diameter, with purple tentacles, 8 of them according to Wiki, but it was hard to see all of them.
One of our local surfers got nailed at the end of our street. And I know of someone else that got it in back of one of the resorts south of Lori Wilson Park in Cocoa Beach.
Keep your Vinegar or Ammonia bottle sprayer handy in the car. Sudsey Ammonia with half water added did the trick for me once, but the resorts keep Vinegar in a bottle to spray you which works well also.
16streets.com had a pretty good write up on the situation with the Jellyfish and what type they are.
Johnson Avenue Surfers 
As of Sunday, May 29, 2011 there are thousands of these jellyfish littering the beach where the water washes onshore. The very few who ventured into the water got stung multiple times.
we have reservations at ocean landings resort in cocoa beach on Saturday the 4th – 11th… driving 13 hours to get there. Does anyone know how bad things are in that area now as far as the jelly fish are concerned? Kids will want to get in the water and play on the beach otherwise, it is a wasted trip. Any advise would be appreciated.
As of the time of this post, there were no jelly fish that seemed to be on the beach by Lori Wilson Park, Ocean Landings (I walked out into the water a foot and did not feel or see any )and of course not in Satellite Beach. We would like the think that the disturbance that created their arrival in the first place has gone, for now 🙂
Watch for anaphylaxis. Anaphylaxis is a severe allergic reaction that can result in:
itching
hives
shortness of breath
wheezing
tightening of the throat
flushed skin
weakness
dizziness
chest pain
CALL 911 IMMEDIATELY!!
Mayo Clinic says most jellyfish stings can be treated with home remedies. Steps include:
Deactivating stingers. Wash off the sting area immediately with seawater to remove any remaining tentacles. Be sure to use seawater; using fresh water can cause more stings to occur. Then, rinse the sting area with vinegar to neutralize stingers still on the skin. Don’t use vinegar for Chesapeake Bay sea nettle stings.
Removing any remaining stingers. Remove leftover stingers by applying shaving cream or a paste of seawater and baking soda or sea water and talcum powder to the sting area. Scrape it off when it dries.
Relieving pain. Ice and over-the-counter skin creams (such as calamine lotion) can help with pain and itching. Rinsing or soaking the sting area with hot water may also help.
ALSO REFER TO WIKIHOW “HOW TO SOOTHE A JELLYFISH STING”