I'd get the bakery up to 50%. It really does make a difference. Like if you're doing the zoo, cookies are a product often. If you're at 50% then a cookie only takes 7.5 minutes and you can do 8 in an hour.
The islands make a huge difference too. I've done the 3 long ones and just starting Fruitopia now. It's so much easier and I think to send them off more often. At 9 hours a trip, I'd generally only send them once a day. Now I've got plenty and it comes in handy for events like this and the restaurant which are asking for a lot of fruit. And the zoo loves peaches and watermelon