For both kiting and in many cases for surfing too, you need useable wind. As a rule wind is in short supply in July. Of course the same could be said about June and we've had an unusual amount of lower wind/breeze so far. You might get lucky in July.
If there is a distant storm center you may well get local swells for surfing even without wind here. Some folks surf just north of Government Cut at South Beach in Miami. Regarding kitesurfing, bad news, it is a poor idea to try to do it without quality pro instruction. We're up to about 120 kiter fatalities, a number of those well intended new kiters trying to learn on their own since 2000 worldwide. There have been a lot more serious but survived accidents than that. Best advice would be to find some good local instruction. Lots of leads to instructors on this site and some interview questions to ask them at:
http://fksa.org/forumdisplay.php?f=85
Have a great trip!