Welcome aboard.
Late February/Early March is a great time to visit, along with September.
No, it's not peak season. Spring break usually happens later in March.
If you go late February, you can expect very light crowds.
Temperatures are 55 for the low, and 75 in the afternoon. All rides are usually working. I've done the water rides. Yes, it was cold in the morning, but I had two t-shirts on, and by the time I did the water rides, things had warmed up. You'll be spoiled with the light crowds, and nice cool temperatures for walking around all day. If the temps are in the low 50s, and it feels cold, then wear long pants and a jacket. Things usually warm up in the afternoon.