My girlfriend and I have travelled to all inclusive resorts in Cuba, Dominican Republic, Jamaica, Mexico, all 4-5 stars resorts and now San Andres! This time for 2 weeks (January 16 to 30) and mainly to scuba dive.
The scuba diving was excellent, lots of variety of fish, saw some sharks, big eels... We dove with Sharky’s, they would pick us up at the resort in the morning around 8:50am for our double dives and bring us back at the resort around 13:00pm. Haynor was our divemaster and he was very knowledgeable. O yes, the tanks and our dive gears were in the boats waiting for us so the service was very good. After negotiating with a few dive shops (Karibik, hotel dive shop...), they had the best prices. I would recommend Sharky’s without any hesitation.
Now for the hotel. The rooms are clean (although dated), nothing fancy, the mattress is firm. The buffet was small and really didn't have much variety from meal to meal. The food wasn't bad, but also nothing to write home about. The service was slow most of the time. We tried 3 a la carte restaurants, the steak house, International and The Thai at the Aquarium, the steaks weren’t cooked... So we gave up and stick to the buffet afterwards. Bear in mind that I’m not a fussy eater at all. The drinks weren’t bad but the alcohol was the typical no name crap bottles that you could buy in town for $4, don’t expect Smirnoff, Bacardi..., go to the Aquarium for that. The service at the bar on the pier was good, thanks to Marly. The beach, if you can call that a beach! is small, not your typical Caribbean beach and the beach chairs had no cushion, so not comfortable at all. As for the Rocky Cay beach (Decameron’s beach), I found it small and dirty, it was fun to walk on the other side to the island. In my opinion, the only nice beach is the public beach in town. At night, be prepared to get bitten by mosquitoes if you are near the lobby or pool.
We did go visit the other Decameron hotel and liked the Aquarium the most, the snorkeling is excellent there. We also rented a golf cart for a day which was fun, we went in town shopping a few times, ate in town at a few places, the meals were very good.
Overall, I enjoyed my vacation but don’t go there expecting the same quality/service that you would be receiving in the Dominican Republic/Mexico (Mayan Riviera). I probably wouldn’t return but would recommend to friends for the scuba diving.

This is a pretty good place for the money, but it has a disadvantages. I will start with the good, the location and the grounds are nice. All the staff are great!!! But.... the rooms are very run down and out dated for such as nice location. The beds are as stiff as a board, if you are a person who needs a comfortable bed this is not the place for you. Also if you want to enjoy a drink or a cup of coffee in the morning on the nice balcony... it's not going to happen you need to walk to the buffet to get yourself :( This is a little bit of a inconvenient if you just want to kick back for awhile before you begin your day. The hotel has good entertainment and the food is pretty good.

We have been to this hotel on 3 seperate occasions and never have any complaints the staff are amazing , the food is good , the rooms are older but very clean and the island infront is amazing for snorkeling , San Andreas and their people are amazing !

I want to start by saying that this is our 4th time to Decameron Mar Azul... which I think says a lot!
Because of this, I knew that their beach/sea here are not the best and hence I have to agree with a few other reviewers, that is its only minus point. The sand is ok if you just want to sandbake but for the sea, it is better to go to San Luis or, to our fav place: LA PISCINITA.
Apart from that I must say it is simply EXCELLENT!

On our last visit, just before Xmas, we had Decameron Marazul to organize our wedding, for 45 or so guests (children, teenagers and adults), from Colombia, Australia, England, South Africa and The States, amongst other nationalities..
I want to thank once again Oscar Pardo and Jhon and everyone else from their team (Maria from reception and Raymond the luggage guy for example). Seriously, they went out of their way to help us with EVERTHING we needed. I have been to some friends' weddings in different parts of the world, friends who got Hotels to to all the planning for them and believe me when I say that I had never seen a team so flexible, so giving, so profesional, so kind, honest and respectful as them. Organizing video beams 30 mins before the wedding for a last minute surprise, change thier menu as per our preferences, suggesting dancing shows for the event, booking restaurants for the guests... and the examples go on and on.
We had guests arriving 1,2,3,4 and 5 days before the wedding and they were absolutely GREAT at helping them and welcoming them.

Yes the rooms are a bit cold... but it is for a reason: to keep island insects out of the rooms. You can just turn it off if you wish.

All our guests raved about the food. The variety of the buffets is SO wide that it was difficult for us to talk our guests into joining us to the restaurants (booking required). The food is FRESH and of the highest quality.

There are plenty of activities for you to do during the day, most of it for free. In the evening, there is always first a show for children and then, there is another that might be more in the adult side of things. Very good shows, I must say!

REally nice people always ready to help... that is all you need when on holiday!

PS/ Special thanks goes to Mirley Miranda from Decameron Cartagena who did all the bookings of our rooms for our guests. She was extremely nice! She even called our hotel's manager to check on us and on the wedding quite a few times!! I have never met her either but we will always be very greatful to her!!