I have been to some pretty big and small mountains in Maine. The biggest mountain I have been on is Sunday River and has about 250 trails. The smallest mountain I have been on in Maine is called Herman Mountain, there are only about 26 trails on it.
Sunday River is the 2nd biggest mountain in New England. They have cabins and resorts and is a great mountain to go to but its expensive. There are a lot of fun trails and multiple peaks.
Hermon Mountain is a very small mountain in Maine. There aren't a lot of trails but its a good little mountain. There are 2 lifts a chair and a T bar.