My Land Suggestion:
Deep ditches: Similar to a ditch. When empty cannot be crossed, and when full irrigates twice as much, and counts as 2 ditches for windpump fill limits and for land attraction value. Costs $25.
Windpump Limit: 10 ditches.
Advanced windpump: Costs $500. Can fill 25 ditches instead of 10.
Bridge: Built on ditches. Works like a path.