Lake Cerro Chato Trail is a 4 mile moderately trafficked out and back trail located near the city of La Fortuna that features beautiful wild flowers and is rated as difficult. The trail is primarily used for hiking, walking, nature trips, and birding and is accessible year-round.
Hike up from Green Lagoon Wellbeing Resort. My husband and I did this last April. It was an amazing experience and well worth the effort. I will say it is NOT moderate in our opinion. It gets VERY steep, but we took our time. Not for the faint hearted.
Starts off easy but gets steeper further in. It can be pretty tricky to get down into the lake in the crater especially if it's muddy but it's well worth it for the swim. This was a moderately challenging hike that took about 6 hours return to complete including an hour stop for a swim. There was a parking lot and helpful guide working at the bottom to give us some insight and map.