Here is a list of some of my favorite things on Kauai:

Breakfast:

Jammin' Banana - They are located in Anchor Cove shopping center, just a couple hundred yards from the shop. Open early morning, fantastic bakery, make their own bagels, breakfast sandwiches, coffee and smoothies.....One of my very favorite places :) 

Lilikoi's (Right across the street from me here in Lihue)

Jammin' Banana (Anchor Cover, couple hundred yards from the shop)

Olympic Cafe (Kapa`a)

Tip Top Cafe (Lihue)

Daddy O's (Lihue)

Keoki's Paradise (Poipu, I think breakfast is weekends only)

Kalaheo Cafe (Kalaheo) 

Kauai Diner

Lunch or Dinner

Lillikoi's (Right across the street from the shop)

Rob's Good Times Grill (Just up Rice St about a mile in the Rice Shopping Center, Lihue)

Duke's (Lihue, right behind my shop)

Smiley's Local Grinds - Lihue - Take out only, Check their specials, they are fantastic! Prime Rib dinner for $26, yes please! 

HukiLau Lanai (Near Coconut Marketplace, our favorite!)

Bubba Burgers (Poipu and Kapa`a)

Savage Shrimp (Poipu)

Keoki's Paradise (Poipu)

Olympic Cafe (Kapa`a)

Chicken in a Barrel (Waimea, Kapa'a, Hanalei)

Brenneke's (Poipu)

Golf

Hokuala (Lihue, entrance is just up the street from the shop)

Puakea (a mile and a half up the street from the shop--Kaua`i favorite)

Poipu Bay (South side in Poipu, former home of the Grand Slam of Golf-(the locker rooms still have all the lockers marked with the golf legends that played there)

Wailua Golf Course About a 10 minute drive from here, a few minusted north of the airport (County Course -ranked #30 best in nation Municipal by USGA)

Kiahuna Golf course (Nice course on the south side in Poipu)

Makai (One of the best courses in the state, beautiful.)

Kukuiolono (Located in the town of Kalaheo. Very reasonable 9 hole course with a mix of par 3-4&5's)

Boating / Sailing Trips

Holo Holo Charters 

Blue Dolphin

Kauai Sea Tours

Capt. Andy's

Makana Charters

Beaches:

Kalapaki (My backyard, practically, couple hundred yards from my front door to the sand)

Po`ipu

Salt Pond

Brenneke's (for boogie boarding)

Hanalei (Fantastic sunsets in Summer)

Lumahai (for relaxing in the summer, not recommended in winter)

Polihale (better have a 4WD to get there)

Ke`e (Permit Required)

Kealia (north end of Kapa`a)

Anini (One of my favorites on the north shore for snorkeling when it's calm)

Snorkeling locations:

All snorkeling depends on ocean conditions, please check with the lifeguards before entering the ocean

Lawai Beach - For the experienced snorkeler (Spring, Fall and Winter)

Ke`e Beach (Permit Required)

Poi`pu Beach

Lydgate Beach Park (fantasic for families or beginners)

Tunnels Beach - For the experienced snorkeler -Spring, Summer, and Fall)

Lehua Rock (Available through Holo Holo Charters and Blue Dolphin)

Salt Pond Beach Park

Anini Beach (Honu, or Sea Turtles)