Have stayed there many times:
1. There is a pool. Not huge but definitely there and very nice.
2. There isn't much of a town center per se, but Portland is only about 20 minutes, and there are some excellent restaurants in South Portland about 10-15 minutes away.
3. The beach right there is really great...a local kayak/SUP rental place opened up on that beach. For active teens they also rent bikes at the hotel.
4. The restaurant in the hotel is amazing, but also just to have apps and drinks overlooking the ocean is really awesome.
We would stay there more often but it is quite pricey, even in more traditional off seasons. Also bring a light jacket - it is usually much cooler there than even in downtown Portland.