I have given my kids "coupons" for time with me (or wife) only. Lunch together, bike ride together, etc etc. They love that more then anything I have given them, and ask for them again.

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1994 C 280 117.5k, White (Good as new)
1997 Toyota Camry 149k Miles (Not so pretty anymore)

1990 190e 2.6 95k (Sold-Should not have)
1981 240d Stick ??? Miles...sold