Sounds like the rest has been covered, but I'll chime in on the plank. I beach my boat a lot while camping out of it and the ramp is priceless. I searched high and low for the perfect one and ended up with
this one from Amazon (also available from discountramps.com). Not only is it nice for walking on and off the boat, but it often covers the gap between the muddy shoreline and dry ground, keeping the boat cleaner. I've walked full 120qt coolers up and down it with two huge dudes and the weight it his sturdy as can be. If you spend a lot of time beached, I think it's a must have.