Spent 2 weeks at the mark warner resort in San ag at the end of june. We have really only positives to report - despite misgivings about going to an all-inclusive resort, we had a superb time.
Kids (4 and 2) enjoyed the childcare, and nannies were excellent, despite our 4yr old being a handful.
Our adjoining rooms in the main hotel were good: substantial and clean. the let down was the bathroom, which was outdated and very tired. we were on the ground floor, which was a bonus in terms of the baby listening service that we used every night: at the end of the corridor there was a group of staff who made rounds every 15 mins. if they heard a child crying they sent a message and someone walked round with a blackboard in the restaurant or bar where you had said you would be. System seemed to work well in the hotel - it was secure (the only other exit was a closed fire exit) - for the bungalows in the grounds the baby listening people seemed to have a long way to cover, and it was very open. Our kids were exhausted by all the activities and playing in the pool, so slept like logs, and the number of blackboards being carried around didn't seem high. There's also a babysitting service (at extra cost, baby listening is free), tho we didn't try that. your kids can also eat with you.
Food: excellent, on the whole. Altho it's buffet style, there was a lot of variety, and there's clearly a policy of avoiding the 'chips with everything' mentality. Kids were happy at breakfast, lunch and high tea. There was a theme for each night for the grown ups, and you could also eat in the pizzeria and the taverna, which were less noisy.
Facilities: excellent. as said, kids enjoyed kids clubs, and older kids would make even more of the facilities - the ones we saw certainly appeared to, and during the school hols i suspect it would get even more lively. The pilates teacher was excellent, and the social tennis was fun every day. The watersports are a highlight:- many people - not us - were clearly keen sailors, and my basic attempts at waterskiing were met with sympathetic coaching.
Summary: despite our intentions, we were not tempted off resort at all. we had a thoroughly relaxing and enjoyable fortnight, as did our kids. they made friends and so did we: without wishing to be snooty, mark warner clientele is clearly a step up from the bog standard package holiday (and should be, given the price): as evidence, we saw only one football shirt all holiday, and that was a cambridge united kit!
Negatives (to avoid this reading like an advert for MW): not enough shade around the kids pool, and an enraging tendency for people to hog sunbeds all day. I saw this provoke a heated exchange between guests, and the following day there were little signs, tho MW did nothing to enforce this. It sounds so trivial, but after a fortnight this kind of selfishness drives you crazy!
WOuld we go again? Yes, we are thinking very seriously about booking for next year, tho we will have to take some deep breaths about paying the school holiday prices.