"Only look for or buy souvenirs when your sim is in a good mood.  This will ensure that your sim has good memories when looking at the souvenir at home." - TEM

"The cheapest way to eat is to grill your own food, but there is a trick that will let you eat for free.  Talk to other guests after they have taken a plate of food.  They'll put it down and your sim can pick it up and eat it!" - TEM

"Upgrade your sim's fireplace at home to one of the news ones included in Vacation and your sim will eb able to display souvenirs on the mantle." - TEM

"Sims with higher body skills will perform better tricks while snowboarding.." - TEM