Spreading: mulch, gravel, soil, etc.

Shovel
Wheelbarrow
Dirt rake (think you can handle it?)

Excavating & Measuring: pond, patio, wall, sidewalk, etc.

Garden hose or rope: curve it into different shapes to plan the outline of ponds, landscape areas, etc.
Shovel (and the energy to use it)
Wheelbarrow
Tape measure

Working with Stone

Masons Hammer: Chisel on the "claw side" and a square-faced hammer on the other. This is the best tool for chipping and installing stone, brick or block.

Level: Three sizes of level are handy – 4-foot, 2-foot and "torpedo."

Grout Bag: Any time stone is laid over mortar, the joints need to be filled in with mortar, but care must be taken to avoid smearing mortar on the face of the stone. A grout bag (which is essentially an oversized pastry bag) allows a precise application of mortar with minimal overlap onto the stone face. Once the mortar sets up (still soft but crumbly), the joints can be dressed to the proper depth by scraping away any excess mortar with a small joint tool.