longboat: if you have 4 people use 4 rowboats you carry 8 items...I believe carts are restricted to rafts for a reason. also it would take a few bars of metal to build a huge ship, not a single nugget.
canoe: should take leather or dried hides stretched over a wooden(branch) frame, but would be quite useless without the huge speed bonus which is quite weird since a row boat would be just as fast as a canoe and more stable in the water.
stone spear: I like the idea of having an early melee weapon besides stone axe, but all the melee skills are for bladed weapons(cleave and such)
wheelbarrow: unless you can put a boat in it, useless. just pave the path you take with your cart and you'll move at 3rd movement speed with no stam loss.
watering can: get a beehive!