Jkomo, we’ve stayed at Hotel Costa Los Gigantes a few times. It’s a big hotel so has lots of facilities – decent pools, high ropes, play area, tennis, mini golf, gym (good spin class), well laid out suite type rooms, room fridge restocked daily with beer and soft drinks. Most importantly for all inclusive, there’s a good choice of food.
Thomson kids club might not be running in Feb but the hotel has it’s own which probably will be.
Beach is about 10mins walk away, steeply sloped volcanic sand with big waves, these are fun but not ideal if you have very young kids.