I think the only way you'd ever be happy would be to give the bulk away. I'd calculate how much was needed to place in a savings account (or multiple) to allow me to make $100K per year + increase at 10% annually while only drawing say 2%. This would allow me to live comfortably and still have some income growth and cover inflation. I would make a few splurge purchases and take my family and best friends on shopping sprees(Maybe set aside $1 million for this). I'd love to be able to head to the local car dealer and tell my buddies to pick out exactly what they wanted. Then, I'd publicly give the rest away and let everyone know my plan. I could be up front about it and let everyone know I don't have any more than an average person you'd meet on the street, so you'd be wasting your time asking for something from me. I think this type of approach would be the most conducive to long term happiness.
With all this being said, I don't buy lottery tickets, so I guess I'll just take the family out to eat this weekend and enjoy that money instead of sending it to government and some lucky winner(s). I'll get more out of my money than millions of people that way anyhow.