We moved here from San Diego county in 2006. It is more humid than southern CA, but not as humid as it is in southern FL. May can be beautiful, it can be hot....have experienced both.
Driving around The Villages is fun and getting lost makes it more fun. You will meet many who will help. TV is pretty large and electric carts have a limited range before needing to be recharged. If you've spent the entire day driving around, remember it will take an overnight charge for full battery power to be restored. Gas carts do have a longer range, but can be a bit noisy. Personally, I love my gas cart...
There are areas outside of TV you might want to visit...you will need a car for that. There are stores and other places to see that are outside of the golf cart allowed driving area. While there are many services and stores on campus, it is good to familiarize yourself with other stores, service providers, parks, lakes, restaurants outside of TV.
You can rent a car in town for the days you want to explore off campus or if there is lightning. A golf cart isn't the safest place to be during electrical activity.
You're going to enjoy visiting our beautiful home town.....so much to see, so much to do. Do as you do in CA, bring a water bottle with you, use sunscreen to help minimize skin damage, and wear a hat and sunglasses. Bring or get one of those Chill towels if you find it a little warmer than you're used to.
HAVE FUN!