Fraser barge

If this was your only chance then yes, Fraser is worth the cost for even one day.
But if you can get back next year and spend at least 5 days or more then save your time and money for then. Be aware that your $90 barge fee is an extra $60 for a trailer.

As a recce do your research online or buy one of the books/maps available and drool over them until next year.

If you can, avoid school holidays and times such as Easter. The place gets really crowded then and spoils some of its beauty. A good place to camp is Frasers at Cathedral Beach. A good private campground, shaded, sheltered, good facilities including a small shop, just off the beach and central to the islands attractions.

Probably be around 20th or 21st of April. We will be camping at Freshwater for a week between the 17th and 23rd.

Perfect , high tide is small . Tues 20th looks best . I take it you will be going to rainbow via the freshwater track . Roughly 2 hours from freshwater campground to the barge at inskip point . It wont be light until around 0630 oclock then so you will get to the barge at about 8 oclock roughly . Lowtide was at 0620 . You should make it around hook point on the beach at fraser ok . You should get to eli creek/maheeno by 1000 at 1147 is high tide so stay the southern side of eli creek . It is a small high tide so you should be able to drive just about anywhere except hook point . Go and see lake mackenzie and central station . I dont recommend driving 1hour either side of this particular high tide . Just go back the same way to rainbow . The barge that goes to hervey bay is extra and it is a hell of a lot longer drive from hervey bay to freshwater . I mean like rediculously longer . If you left central station at 1500 i reckon you would get to freshwater about 2000 or 2100 .