HMS Amore: Fulfill all of Betty's Wants until she is platinum. She will then tell you where the next location is. One of her wants will be to marry Captain Nelson.
Cliffside Retreat: Fulfill all of Isabella's Wants and make her happy. Note: It may be difficult and take some time to get her to make a sandwich.
Shoreline Trails: Buy a Foosball Table. When a Want that is described as "Beat Torin at Foosball" appears, wait for Torin to play, then click the "Challenge" option and defeat him.
Sunset Canyon: Bring Helga, Billy, and Sheila back to life, build a kitchen, clean up the mess, build a bathroom, and give them beds to sleep in. They will then tell you the next location.
Rockwall Acres: Follow the instructions given to unlock this area.