We have stayed there i found it awesome. very jungle-y. closest feel to cayo on the island for me. Birds and wildlife GALORE!
Here's a review i wrote for TripAdvisor awhile back. don't know if they ever published it!
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"Wonderful Resort!"
We just had the pleasure of staying at Sueno del Mar on the north end of
Ambergris Caye, Belize. What a fabulous time we had!
Lush surroundings and a very modern resort, luxury in the jungle of the
cayes. Large units that are generously furnished. Very Clean. Unusual
perhaps for resorts more off the beaten trail, everything works! The
microwave, oven, tgelevision, wireless internet, it all works! Hot water
with plenty of supply. No trickle of cold only water here.
The staff is extremely accommodating and friendly. Excellent food by the
chef of Blue Moon in San Pedro. Every meal was fresh and a treat for the
taste buds.
It is situated up north where there are not many homes or resorts, thus
the bird, animal, and wildlife populations are much more significant
than further south on the island.
Large nice boats to get to town and back, provided by the resort.
Excellent snorkeling as the reef has gotten very close to the land at
Sueno. Located in a marine protected area also so pristine environment.
A small catamaran is provided, along with kayaks and other floating fun
toys. Two very nice pools as well, with a rock-like waterfall at the end
of one you can lay your head back into...
We HIGHLY recommend you give Sueno a visit. You will be very glad you
did.
AmbergrisCaye.com 
