Jaco, Costa Rica / City Guide.

The Jaco/ Herradura/ Hermosa area offers a variety of activities and dining options that are among Costa Rica's best. These are my suggestions while visiting this mid-Pacific paradise:

Restaurants

Lemon Zest
Lemon Zest is best known for it's duck but the lobster is also great - actually most dishes at this restaurant are awesome. Located in Jaco this restaurant offers a complete wine list in a dressier atmosphere.
Adventure Dining
Overlooking Costa Rica's tallest waterfall and with a spectacular view of the Pacific Ocean, Adventure Dining offers an incredible fine dining experience. You are picked up at 4pm at your hotel and brought back at 9pm - the standard menu is Filet Mignon, Lobster and Jumbo Shrimp but the chef actually calls you in the morning and will create a custom menu just for you. This restaurant is the utmost romantic experience for an older crowd. Located about 30 minutes from Jaco.
Los Suenos Marina
The Marina offers 6 restaurants from Italian to a sports bar. Each restaurant is good but the Italian "Lanterna" restaurant is my fine dining favorite. The "Hook Up Bar" overlooks the marina in a very casual atmosphere. Located in the Los Suenos resort in Herradura.
Wishbone
Try the Poki dish. Easily my favorite in Jaco. Good for all ages this restaurant is on the main road and has a quiet casual atmosphere.

Bars/Nightclubs

Claritas Bar
Right on Jaco beach, Claritas is my absolute favorite. The food is great, specially on Fridays when they offer the 1Kg BBQ ribs for just $9. Thursday they have $1 beers and every night Claritas is full of energy.
Puesta del Sol Bar
Right on Herradura beach, this is the quintessential fisherman's bar. Enjoy the sunset and the fresh seafood as they cook sportfishermen's daily catch. They offer good drink prices like $2 beers (not bad considering it is right on the beach).
BackYard Bar
Enjoy spectacular sunsets in Hermosa beach at the Backyard bar. They offer a daily happy hour with free food and great tropical atmosphere. I recommend the tuna burgers and the shrimp basket - go there on Saturdays when they have their own surf tournament.
Amigos
Good for all ages, even kids - this bar offers great burgers and other bar food. Located in downtown Jaco, Amigos offers a casual atmosphere with outside tables.

Activities

ATVing
Jaco offers the perfect rainforest ATV options. Take your ATV 15 minutes and you are in deep mountain rainforest. There are two hour tours that take you to waterfalls, rainforest and the beach for around $70.
Pura Vida Gardens walk
A little outside the Jaco area, this spectacular garden is for the birding aficionado. You literally tens of macaws and other birds while also seeing the Bijagual waterfalls and the Pacific ocean. Cost $20.
Fishing
The Los Suenos marina in Herradura beach is the only government sanctioned marina in Costa Rica. This 200+ slip marina offers awesome Marlin and Billfish on 26 to 52 foot alternatives. You pay from $500 to several thousand depending on the size boat you hire.
Golf
The Marriott Los Suenos golf course inside the Los Suenos resort is Costa Rica's #1 golf destination. These course offers beautiful rainforest views and a course full of monkeys, macaws and iguanas. Los Suenos photos
Canopy Tour
There are several canopy/ziplining options in the Jaco area but my favorite is Canopy Los Suenos option. Costing $60, they will pick you up at your hotel and no cost.
Carara National Park hike
This National Park is about 20 minutes from Jaco and offers a great rainforest experience. Great family fun, I would also visit the 'Crocodile River' while visiting the park.

There are plenty of other suggestions like taking a day tour to Manuel Antonio, visiting Villas Caletas to see the sunset there, and other good restaurants but I wanted to limit my list to the best of the best for a group visiting the Jaco area for 7 days.