I ran a 10 miler on the sunset beach, Treasure Island Florida. It was 89 degrees and the sand was not only hot but soft. I wasn't sure I could pull off a long run in the sand and heat but I made it. My pace ended up being around 8:40 so I was pretty happy. The greatest part was hitting the water right after the run and swimming my cooldown!
I was able to get in all my scheduled runs during vacation though I didn't do much speed workouts. I sure did a lot of running in 88-92 degree weather though. There is something really nice about runnning on the beach.