i love houseboating!!! we go every year to either lake shasta or lake powell. something we always grill on the boat is carne asada (skirt steak) that I pre-marinate with salt, pepper, chile powder and lime juice in a zip-lock bag in the fridge. i usually do this about four hours before we start to grill. we make carne asada tacos with chopped onions and cilantro and salsa, and a chipotle crema.

if there are enough leftovers, you can make breakfast burritos the next morning.

for desert - grilled peaches with marscapone and honey cream!

Since you may also have limited water, think things that use few pots/ pans/ prep bowls. Using the grill for most meals makes the most sense- steaks, chicken, even a whole fish can be grilled. Do you have a good grocery store nearby? You may be limited by what is in the area. Ask at the marina ahead of time for suggestions, too. And do as much prep ahead as possible & store in ziploc freezer bags.

Remember a couple of huge coolers filled with ice & beverages. Use the fridge space only for food items.

Not sure if this will help you or not, but I get invited out on my friend's sailboat a lot because everyone likes the food I bring.

We only go out on Lake Michigan for a couple of hours, so everything I bring is already made and ready to serve.

Here are some of the things that people have really enjoyed: cold noodles with spicy tahini (or peanut butter sauce); caprese skewers (baby mozzarella with grape tomatoes and basil); cold salads with shrimp or grilled chicken). Blondies or brownies are super easy to make ahead. I made a dessert once with cut up bananas, chocolate pudding and crushed Nutter Butters - it was a big hit.

Many years ago, we did a sailing trip in the Caribbean and we actually brought prepared food from Chicago on the plane. I brought a frozen lasanga. Not only did it survive the trip, it was delicious (but maybe a little out of place in the islands) :)

I know this will sound slightly self-indulgent as I work for a houseboat resort company, but most of our customers do a sort of collaboration of meals. I've got Monday, you've got Tuesday, etc. Depending on the type of boat you are going on, make sure that it has the appliances you need for cooking what you are planning and please remember that most boats don't have condiments, spices, etc, so you'll need to remember that.
The best food I've had on a houseboat was actually a marinated chicken that has been pounded flat and soaked in a Pappy's(sp) seasoning and Coors beer. As another cooking tip for boating, remember that food tastes different on the water due to humidity level and pressure changes, so a fine wine is okay, but will taste completely different on a boat.
I hope that was helpful.

Although this company is one of our main competitors, I really like this Recipe Award they did back in '07.
http://www.sevencrown.com/recipes/index.htm#squealer

Ben Jackson
aka "the Captain"
http://CaptainJackson.wordpress.com