The Pinellas County Transit Authority does have beach routes. The Jolley Trolley (part of PTA) also runs the beaches.
Dedicated bike and walking lanes allow additional ease of access to the beaches from the mainland.
Take a look at the PSTA site
Wishing the the very best of success
Annette Lawrence, Broker/Associate
Remax Realtec Group
Palm Harbor, FL
I am not sure of any specific bus businesses that focus on beach delivery but the idea does sound great. I know some hotels will do the trip but I can't think of a condo that does at this time. Possibly use this link to help you. I recognize a few of the beaches on their list.
If I can help not answer another question, please don't hesitate to send me a message on Trulia. Wish I could have been more of a help. I love the area and I am sure you will enjoy your time here.
Prudential Tropical Realty
THANK YOU if anyone does know if one can go to the beaches via transit. Probably not, but, thought i'd ask.