leave Malta early, as it will be hot - aim for say the 9am ferry, so you arrive in Gozo at 9:30am.
Swimming - best beach is Ramla.
Things to see - depending on your interests, there are so many things to see and do - these are the typical ones - let me know what type of things you like, and I can suggest others

Citadella in Victoria
Ggantija temple
Dweija for the Azure window

for lunch, try the restaurants in Xlendi

before heading back to Malta, pop into Gleneagles bar, near the ferry terminal

best website for info is http://www.gozo.gov.mt/pages.aspx?page=En

Hi there I agree with all of the above but while in Dweija for the Azure window pop down to the inland sea and take the small boat through the opening into the sea. Only 1 Lira last year and well worth it. Also go to the sanctuary at Ta'Pinu (the miracle church) and read all the letters in the little side room. Oh and the church at Xara (tut at spelling!) is most beautifully decorated inside. you pass it going to Calypso cave. There is so much to see in Gozo a day is not enough.

Well Ive accpeted that I wont be able to see everything in Malta in a week but hey thats why you go back to place

I thought we would head to Dweija and see everything in that general area and proberly swim, then go to Victoria and see Citadella and the general area.

Then fnish going off going to Ramla for a swim before heading back for a drink.

I thought that would sort of be a highlights trip although we tend to always see other bits on our way.