Nicoya [1]’s most northerly beaches ring the horseshoe-shaped Bahía Culebra (Snake Bay), enclosed to the north by the Nacascolo Peninsula, and to the south by the headland of Punta Ballena. The huge bay is a natural amphitheater rimmed by cliffs with coves sheltering gray- and white-sand beaches and small mangrove swamps. There are remains of a pre-Columbian native settlement on the western shore of the bay at Nacascolo.
The north and south sides are approached separately by a pincer movement. The south side is reached via the road from Comunidad to Playas del Coco [2] (the road divides two kilometers east of Playas del Coco; a turnoff leads three kilometers north to Playa Hermosa [3] and, beyond Punta Ballena, to Playa Panamá [3]).
The north shore is reached from two kilometers north of Comunidad via a road immediately west of the Río Tempisque at Guardia. This road is a fast, sweeping, well-paved, lonesome beauty of a drive that dead-ends after 15 kilometers or so at the spectacular Four Seasons resort (no entry except to guests).
En route you pass Witch’s Rock Canopy Tour (tel. 506/2696-7101, www.witchsrockcanopytour.com [4], 8 A.M.–5 P.M. daily, last entry at 3:30 P.M.), 18 kilometers from Guardia. It has 23 platforms over a 2.5-kilometer course with four hanging bridges and even a tunnel ($55).
Marina Papagayo (tel. 506/2690-3600, www.marinapapagayo.com [5]) opened in December 2008 near the Four Seasons at Playa Manzanillo with 180 slips.
Playa Cabuyal, immediately north of the bay, hosts the super-exclusive members-only Ellerstina Costa Rica Polo & Equestrian Beach Club (tel. 506/2258-9219, www.ellerstinacr.com [6]).
Papagayo Fishing and Canopy (tel. 506/2665-8458, info [at] papagayofloating [dot] com), on the road to Playa Cabuyal, has an 11-canopy zip-line tour plus float trips on the Río Tempisque.
Oasis de Papagayo Villas and Cabañas (tel. 506/2443-3201, www.hotelpapagayo.co.cr [7], $50 s/d), near Playa Cabuyal, offers five simple and modestly furnished cabins, as well as a pool.
The Occidental Allegro Papagayo (tel. 506/2690-9900, U.S. tel. 800/858-2258, www.occidentalhotels.com/grand/Papagayo.asp [8], from $250 s/d) overlooks Playa Manzanillo from a superb breeze-swept hillside perch. This four-star all-inclusive resort has 308 graciously appointed air-conditioned rooms in three-story edifices stair-stepping the hillside. Action centers on the huge pool with swim-up bar. A theater hosts shows, and there’s a disco and sports bar, plus water sports and scuba. Alas, the paltry gray-sand beach holds little attraction.
The super-deluxe 
Four Seasons Resort Costa Rica at Peninsula Papagayo (tel. 506/2696-0500, www.fourseasons.com/costarica [9], from $495 s/d), at the tip of Punta Mala, brings a whole new panache to the region with 145 spacious guest rooms, including 25 suites, exuding luxury, fine taste, and every amenity you could hope for. Facilities include a gorgeous spa and Arnold Palmer–designed 18-hole golf course (open to resort guests only). The setting is sublime, with two distinct beaches to each side (one bayside, the other shelving into the Pacific Ocean).
Links:
[1] http://www.moon.com/destinations/costa-rica/the-nicoya-peninsula
[2] http://www.moon.com/destinations/costa-rica/the-nicoya-peninsula/playas-del-coco-and-vicinity/playas-del-coco
[3] http://www.moon.com/destinations/costa-rica/the-nicoya-peninsula/playas-del-coco-and-vicinity/playa-hermosa-and-playa-panama
[4] http://www.witchsrockcanopytour.com
[5] http://www.marinapapagayo.com
[6] http://www.ellerstinacr.com
[7] http://www.hotelpapagayo.co.cr
[8] http://www.occidentalhotels.com/grand/Papagayo.asp
[9] http://www.fourseasons.com/costarica