KTO - I appreciate the fact that you are not against 'RAFTING AT ALL...' But if these petitions pass, you are saying you are against ALL RAFTING... Why would anyone let a few of these inconsiderate idiots ruin it for EVERY OTHER PERSON who shows some responsibility on the lake....
How do you stop someone from causing a problem or making a mess...you make it sound easy to reason with people who are drunk 
1)Why not yell out to the people who are throwing their Coronas overboard or confront them about their trash/diapers??? If they are on your land leaving their diapers behind your trees, they are trespassing... You should post no trespassing signs... Or, better yet, why not call the marine patrol, fish & game, DES, or the local PD - whoever will respond to cite the people littering on the lake or littering and trespassing on the land. Actually, I know it is not your job to confront the violators, sorry - so lets just post it a no rafting zone and then they can dump their trash and diapers some where else... Making an area no rafting will not solve that problem!!!
Actually, we called Marine Patrol and they said to call them if any of this occurrs, but what can they do if they never SAW anyone doing this or the people deny it the whole time? We are going to start calling though if it gets out of control.
2)And it only get's worse! Just two weekends ago, these rafters were parking on private community property, walking across private community property (note that these people left their cars on PRIVATE PROPERTY!) and paid no attention to the community itself.
*- KTO can you elaborate on this??? I am a little confused as how the rafters (who are boaters tied together) parked their boats on community property, walked across (water?) private community property and left their cars/boats (illegally - I'm assuming) on private property and paid no attention to the community itself. Is this your own personal property that this happened on??? If not, why is it your issue??? If it is your property, why didn't you do something about it at the time, like have the cars towed or tell them to move along... Actually, I'm obviously kidding a bit here... I am thinking that you actually mean the people who had cars, parked them and went to meet the rafters??? Did they swim out to them or something??? Usually, when we go to a quiet secluded cove, you cannot get there by car... So I don't get the gist of this portion of your argument... Rafting has nothing to do with cars obstructing a water front property owner's path of travel into and out of his cove/dock by boat and/or obstructing their swimming areas... Sorry for my confusion...
This was all car parking on private property (It's a private community, which we did just recieve No Trespassing signs) They would walk along our property, cross over to another property, and it's shallow enough to wade out to your boat where these boaters park. (It pretty easy to carry your 12 pack of beer over the water too! 
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3) WHAT OTHER OPTION IS THERE??? How about EDUCATION!!! Let's get the boaters educated about keeping the water and surrounding land clean and trash free. I know all of my rafting friends have garbage cans and garbage bags that we use on our boats... When we gat back, we all make a trip to the dumpster! Let's get a little responsibility on each side and the lake will be a better place... NO MORE FINGER POINTING... ACCOUNTABILITY and RESPONSIBILITY IS KEY!!!