Sunday 14th- Hollywood, Tar pits, Observatory- Dinner at Pinks
You are very close, about 10 mins, to Pink's from the Tar Pits, not the Observatory. I would either put the Observatory first or last. It's open from 10a-10p on Sundays and you're only a 15 minute drive on the street from Hollywood.
Tar Pits are open from 9:30a-5p. I'm a member but I would say that it can easily be experienced in 2 hours.
The Tar Pits are also the most Westward destination you have planned this day, I would say venture there first and maybe do Pink's for lunch, then head to Hollywood and do the Observatory last (even though it does get busy in the evening & parking becomes a slight issue, but it is better experienced at night anyway). This would involve no backtracking driving, you'd just keep moving Northeast/East. There is a pretty good cafe at the Observatory but also lots of eateries down the mountain in the Los Feliz part of town, including Louise's Trattoria (a personal favorite) but lots of other option abound.
However you choose to do Pink's though, keep in the mind their lines get looong and parking isn't extremely plentiful, so don't get plan to get there already starving.
Monday 15th- Malibu and Getty
Good day just bear in mind it's a Monday and you'll encounter some traffic heading to/from your destinations; the 405 and 10 are a little busy all day and very crazy during drivetime traffic.
Friday 19th LA Science Center and dinner with the family
The only eating options at the Science Center (10a-5p) are a McDonald's and Taco Bell. There's a nice, new cafe at the adjacent Natural History Museum (which I would recommend you do as well). If you want to eat elsewhere, just plan ahead as there isn't much else in the area outside the museum complex and I wouldn't recommend you stay in that area to dine (not unsafe in the museum area but a bit unsavory outside it).
The Science Center is a 'suggested donation' museum and the IMAX movies are fairly cheap. The Natural History Museum (9:30a-5p) is, in my opinion, a lot nicer than the SciCenter and offers more to see. I would opt to start at the Nat and check out the SciCenter afterwards. I don't know how many are in your party, but a family membership may save you money, it's $80, because it includes membership to the Tar Pits museum.
Hope you have a great trip!
