You need to make sure that the room you rent has A/C in it and you will sleep fine. There is usually a nice breeze coming in off the water and if you're in the shade, you should be very comfortable, even during the day.

Most restaurants have open walls so A/C would be silly.

I didn't see any chair rentals but some of the hotels have sitting areas either in their garden areas or on their dock, if they have one. I did not see floats or rafts.

It sounds like you need to make sure you're renting the right accomodations so that they have what you need to be comfortable. Make sure you ask all the questions when you book your room.