Since May 12th 2023 the rules regarding COVID-19 have been relaxed. You no longer need to provide evidence of vaccination.
There are no quarantine requirements in the US anymore, and although tests 3-5 days after arrival are recommended, they are not mandatory.
See the latest information on COVID-19 rules here: https://www.ocean-florida.co.uk/covid-19-latest-usa-travel-news/.
Concise information about all aspects of planning to travel can be found here: https://www.ocean-florida.co.uk/preparing-to-travel/
In short, yes! All parks and facilities are back to normal.
Masks are not required on flights, nor while traveling in the USA. However, as always this is a personal choice, so if you feel safer with a mask you are free to wear one.