We actually didn't stay at the resort itself, but raved about the beauty of Duli beach and coolness of the resto-bar at the resort. It really felt like too good to share with others. It's a secret place you'd like to keep to yourself.
After taking island hopping tours in El Nido, we decided to have one day to just drive around and explore a bit for ourselves. We were on our way to Nacpan beach, but as we've missed the turn, we decided to visit Duli beach first. It was a true bliss! What a gem! Just you, beach and the sea! It was the best part of the day and definitely a highlight of our visit to El Nido. After Duli beach Nacpan beach felt like a tourist trap - overcrowded and full of litter. While Duli beach felt like a serine paradise.
Do not get scared by a rough road - take it as an adventure. Do not be afraid of not finding it - people are eager to help around. Do not get upset with 30PHP/pax entrance and some 20 for a bike parking, even if you think they charge illegally - after-all it's just around 1-2EUR total, but it's for sure big help for locals.
And big thumbs up to the hosts at Duli Beach Resort! It was really nice chatting with them, sipping on a cocktail in their beach resto-bar.
All the best for your projects from Estonian and Portuguese! ;)