I got LP by having toddler in the swim centre to get the toy eg. Bears cats etc. in the house continuously. After the first time, each time you collect all toys you get 6 LP. When I got to 20 LP I bought another house and placed it in one of the Sims homes then I had 2 toddlers finding toys continuously. Then I bought another house and I have 3 toddlers finding toys. 6 LP adds up.
Also I got 3 sims cooking cheese toast (1 min) continuously and the 4th sim cleaning, because after the initial collection each additional collection of utensils gives you 5 LP and since the time to cook is one minute you can find them a lot quicker than waiting for the toddler but both works well. Obviously, if you have more Sims cooking you would get LP a lot quicker.To date I have 120 LP. Hope this helps.