There are several free things that you can do in Seattle. However, some of the best free things to do include the following:

1. Enjoying the sunset from the waterfront: This is a great experience especially on one of the clear summer days.

2. Riding a ferry across Puget Sound: You could take a narrated tour of the Seattle waterfront by taking a ferry from Bremerton or Bainbridge Island and can enjoy Elliott Bay as well as more of Puget Sound.

3. Relaxing over a latte: You can relax in a frothy latte in a cozy cafe. The enjoyment can be further increased by grabbing a magazine and hanging out till the time the rain finally stops.

4. Riding the monorail: The monorail gives an altogether different experience to enjoy the city. It may be though a very short distance, still you can enjoy a lot in a monorail.

5. Exploring a Waterfront Park: There are several waterfront parks where you can enjoy a lot by gazing at distant shores, by running on the sand or walking through the forests. Some of these great parks include Discovery Park, Seward Park, Golden Gardens Park, etc.

http://www.frommers.com/destinations/seattle/0032020765.html

Pretty much like anything in Seattle it will depend on the quality you are expecting.

1. An a la carte menu will obviously be more expensive than a boxed lunch menu.

2. Having a buffet will generally reduce the cost as it is less expensive than having a sit down meal with a set menu; this is because there is less preparation involved.

3. You can expect to spend anywhere between $15 and $120 per head depending on the quality and style of food. Some caterers offer better deals for larger quantities of food, depending on the level of service required.

- This site provides information about the cost of food in Seattle:

http://www.city-data.com/forum/seattle-area/280699-examples-food-prices.html