We have been cruising with our kids for many years. We got our first boat when we just had one child and he was 2 years old. We now have 3, all boys, ages 6, 9, and 13. We spent many enjoyable days on our previous boat, a 21' Venture with the kids in all stages from infants, toddlers to well, real kids. I added lifelines and netting to the Venture to make it as kid friendly as possible.
Once our 3rd got out of the toddler stage it became obvious we needed a bigger boat with more places to sleep so we moved up to the 26x. It has been an excellent family investment. I notice many things are different when we are boating. The family interaction and adventure you get out boating is hard to match any way else. Living together in a mac can be at times trying, but in the end is always rewarding. As my 13 year old put it at the end of one trip, "He was amazed how he actually enjoyed living with his whole family for a week in a space smaller than his room."
I also find that boating is great for the kids confidence, and brother to brother relationships. They can't get away from each other, there is no one else to play with, so they have to play together. In the course of this they have become much closer. As we tell them " friends come and go, brothers are for life." They also are developing independance through the experience. We will take them to shore and drop them on an island while we retire for some quiet back on the boat. Even though we are only anchored 30' away, and can hear every word they say, to them we are not there. They can't cry to mommy when they feel wronged by their brother. They have to solve their own problems and find a way to be happy playing together. As they grow in both age and their boating abilities they are taking on more and more responsibilities of operating the boat and this is great to watch.
Our longest trips have been 6-7 days. More comfortable is 3-5 days. We prefer to be anchored out or on a mooring buoy than at a dock. All the park docks around here are usually covered with landlubbers trying to get near the water any way they can. Fishing is always part of the action, though rarely any real catching. Crabbing is another favorite. Trips to the beach to build forts out of driftwood are also a must on each trip. Hikes, and occasional things like a dinner out can be a nice change. Swimming and tubing in the summer is a hit. We will try knee board and wake boards this summer.
For us launching and getting under way is always a stressfull time. We are almost always behind schedule and therefore take shortcuts in our loading and preparations. We have gotten in the habit of doing what we have to to get on the water and getting under way as quickly as possible. Once we arrive at our first destination my wife then heads to shore with the kids while I get the boat really ready for the trip. They then come back and we have our traditional first night dinner, weaners and beaners.
The key to multi-day cruising in a mac with kids is organization. The motto is "a place for everything and everything in it's place". You have to come up with a storage system that eliminates the need for tedious conversions as you move from event to event. If you are endlessly moving things around the boat to make room for the next activity (ie: cooking, sleeping, playing, movies, etc) things can get real old quick. We also typically have a time each day where my wife takes the kids off the boat and leaves me alone for a bit to restore order to the boat. Without this daily attention the mess can become a nightmare.
I can think of no better affordable, flexible, multi activity boat than the mac. It lets you 'get out there' rather than just dream. Even though in the minds of some boaters it may be low end, in the minds of all those stuck on land you are one of the lucky few on the water with your family having a blast.
Check it out, 2 X's, 2 families, each with 3 boys, tied up side by side on the dock having a blast. My kids are the left ones in each pair.

The happy parents, we're on the left.
