The hook is used to hold the main sheet and provide some drag (friction) on the sheet. You put the sheet under the hook and pull up to reduce the force needed to hold the sheet. Mounting a ratchet block replaces the hook and provides a quick-release cam cleat action.
It would be highly advisable that your lady also knows how to sail so she can move in the right directions and can anticipate tacks, etc. Two on a Sunfish is not a "cocktail sail" unless there's very little wind.
Correct. The Occidental all-inclusive in Aruba has Hobie Waves, a small cat. They were free when we were there years ago. Used to have Sunfish but they were pretty beat up. The wave is a fun boat. The wind at the Occidental can be strong and gusty as it is all over Aruba, so I hope you're not a...
I used the old rudder for many years but as the mechanism got worn the rudder would pop up when going fast in a stiff wind. This was especially true on the ocean with waves. On a lake it will most likely be fine.
I used it in soft sand but not a long run of it. Needed a little more umph to move it. Two people would be a help: one pulling, one pushing.
It's also very easy to break down and pack.
Regarding the comment on Amazon about floating the boat off the wheels: don't do that. One person can lift each...
I have used this for years on Cape Cod: http://www.amazon.com/Davis-Wheel-A-Weigh-Small-Boat-Dolly/dp/B000KKB2S4
Don't know how fast you can get it fromAmazon. Maybe find one at local marine store.