I am not familiar with the club itself, but Las Galeras is lovely. Verdant and hilly and with turqoise waters. The beach of Las Galeras itself is better for snorkeling than for swimming, although you can find a few strips without coral. But if you walk along the beach for about ten minutes you end up at the beach in front of Casa Marina Bay. Soft, soft golden sand, palm trees and no coral. Perfect for children. And as all beaches in the Dominican Republic are public, you can laze about all that you like.
There are some other really great beaches in the area and some pretty good restaurants. I particularly like the restaurant at nearby El Marinique Resort.
Las Galeras is small but with a few shops and local artist. You can step on the guagua (mini bus) when you feel like adventure - it's a great and very cheap way to see the country and get REALLY close to the locals ;-) Or you can join the more organized tours. The town of Samana is about 20 minutes drive from Las Galeras and a good place to spend some hours. Especially at the market.
If you can find a tour guide that will take you to Playa El Valle you ought to try it. It's an amazing place. You have to cross a couple of unbridged rivers (horse or 4WD necessary) and you go through rain forest and tiny villages to end up at an awe inspiring beach. It is normally too dangerous to swim there - the waves crash in directly from the Atlantic and the surge is very strong. The sand is almost black and a little river runs into the ocean. There isn't a lot to do there but to sit and enjoy the view but if you like this kind of thing, you can sit there for hours.
I recommend Las Galeras warmly, but for info on Club Bonito itself I hope somebody else will help you along.
Regards, Susanne