One of our favorite things we did in Manuel Antonio is having an organized beach picnic by The Fringe Umbrella, which is a boho style restaurant in Manuel Antonio. You can book either a picnic for lunch or a bonfire at sunset. They will set up a cute picnic for you with food and drinks and even light the bonfire if you choose this option. The price is 200$ for the whole picnic experience including food, drinks, and the setup. A great thing to do especially if you are with friends and family.