Remember the Green Marina Initiative
when you are winterizing.....
Contain & Absorb - Keep absorbent bilge pads under your engine to contain drips and keep leaks from migrating into bilge water. Use a drip pan under your engine when performing engine maintenance.
Use Non-Tox Antifreeze - use propylene glycol antifreeze for all systems as it's less toxic than ethylene glycol. But remember, even propylene glycol is no longer "non-tox" once it has run through an engine. Take care to recover and recycle it. 
Choose Cleaners and Paints Wisely - Choose the least toxic cleaners and antifouling bottom paints possible for
your specific use and environment.
Please dispose of properly.
Don't Top-Off - when fueling, fill up to just 90% of your tank's total capacity. Leave room for fuel expansion and help avoid spills.
Make sure the head system is compliant with current local and USCG regulations. Zero discharge is now mandatory in CT.
Please PUMP OUT before hauling.
Make sure no leaking oil or fuel can reach bilges where bilge pumps operate. Contaminated water pumped overboard will result in stiff fines.
Ask where to dispose of old oil or fuel. (NOT the dumpsters !)
Change light bulbs to LED's to reduce energy consumption.