If you visit the space center (on Merritt Island just east of Titusville) you could drive south and then east on one of the causeways to Cape Canaveral or Cocoa beach which are on the ocean.
My place is almost an hour closer to these locations than you will be, if you are staying on or near the Disney resorts. From those, Tampa/St Pete are almost as close as the Atlantic coast.
Always nice to be on the ocean!
We lived in Lakeland in 1969. I remember when Roy Disney made the announcement for Disneyworld. We were dirt poor and couldn’t buy anything for speculation.