The beach is fairly wide and parking isn't that bad, except during the afternoon on the weekends when the weather is good. One drawback of the northern end of the recreational area is that the dunes are also home to several dozen Hobie Cat's and you need to stay clear of their masts. I haven't tried buggying here as the recreational area isn't very large and the Hobie masts get in the way. This site is generally good in all winds unless they are mainly from the West. Haulover Park is home to Skyward Kites and usually attracts a crowd of kitefliers, especially on the weekends.
Parking is plentiful.
This site is generally good in all winds except from the East which is partially obstructed by the A1A road embankment. Go about 16 blocks to the North and there is a small park called Ocean Beach Park which has grills, bathrooms and shelter right at the entrance to a large public beach. I haven't personally flown there, but the site should be good in all winds except from the West. On the beach in front of the Traders Ocean Resort Hotel there is a group of fliers that gather regularly Friday evenings. As with most East Coast Florida sites, it should be avoided when winds are from the West.