Massabesic is a fun lake to kayak on. At the stairs, you can either go to your left (West-ish), under the bridge, or to your right. If you go to your left, a large part of the lake is "off limits" if that bothers you, due to the water treatment plant. Also, there is a very large island that you can go around, for a neat little trip. To the right, if you go past 'Battery Point', you can go left where all the sailboats are, or to the right. To the right, you'll encounter many small little islands which make great picnic spots as well as some decent scenery.
Also at the stairs, there is a trail that you can follow (on foot), and come out to Battery Point, which gives you a decent view of the eastern part of the lake. This trail is pretty well-known, and you almost always run into a few people. It is also pretty straight-forward, with only two offshoots. However, there are many better trails around Massabesic. If you continue north on 28, and take your first right at the rotary, you can follow that road until you reach the second, third, or fourth trail-heads. (You'll see the 'no vehicle' gates) These all lead to a little web of trails that all eventually lead along the lakeside. If you follow them far enough, and take the higher trail, you can come out on top of a small little mountain, with an amazing view over the lake. If you continue past that, you just go further along the lakeside.
Oh, and I actually have no idea how long the lake is by the way. Just ignore the 10 miles, it's a guess.
If you take 28 North, just continue on through Auburn. You'll eventually come to a point where you're right at the lakeside, and the shoulder is rather wide on the East side. (If it's a nice day out, you'll see a few cars parked there) You can either park on the side, or there's a small little parking area for putting in, with stairs down to the water. You can keep going north, and there is a small little beach just before the rotary on your right with some picnic tables that you could also put in at if you wanted to reach the furthest point of the lake faster. (cheater!) There are also some more trails here, but nothing too great.
Coming from the North, just take 28 South through the rotary, and keep going until you come up on the lake again. Once you go over the little bridge, the entrance is RIGHT there, so either try to find a spot in there, or turn around and park on the shoulder with the rest of the cars.
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