I like cntry list, and that hacksaw is valuable. Makes nicer cuts than the chainsaw.
Another item is baling wire. Have tied some things together with it before. Can of WD-40 and maybe starter fluid to dry things out.
Electrical tape works for short term repairs on radiator and oil cooler hoses holes. Works better is you have starter fluid to clean the hose, and then cap it with a hose clamp.
A piece of the same diameter oil cooler hose and/or radiator hose about 6 inches long. Cut into 3 inch strips, then split, and clamped in places with hose clamps can sometimes stop a leak in a hose - use it like old fashion pipe clamps.
There is a cloth tape called bulldog, used alot in seismic operations. Forget the name of it, but it is fairly weather resistance and stick really well. Have seen a cage idled in with it taped together.
Jumper cables come in handy at times, but need long ones to reach from boat to boat. And they are hard to store.
If you are really doing long trips with little chance of having people chance meet you, a fuel pump, light weight starter and alternator fit easily in some water proof containers. Lots of boats had them around the seismic field. Usually in the truck, but on the Alaska Gold Forum, some of those guys talk about 100 mile trips up/down river. In my book, 15 pounds of parts would be just as useful as its equal weight in fuel (2 gallons) in remote country.