(This walkthrough was contributed by NealsMama. I'm just posting it here so it gets its own link in the library list. -R)

Here is a walkthrough for Coral Cove waterpark - Level 4. This should earn over 23k.
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First, choose the standard running shoes. You'll need to move quick.
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Here is the layout of tables:
2 is closest to the cook station. 1 is closest to the lemonade. 3 is in the middle. 4 is closest to the lemonade and 5 is closest to the dishpan cart.
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Round 1 - 5 tables
Set out flowers and go to podium. When it goes off, seat in order:
4 bookworms - red - 1
4 bookworms - blue - 3
2 girls - blue - 5
4 girls - 2 green, 2 yellow - 4
2 women - red - 2
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Fetch chili, take orders to station and deliver. Get more chili. Go to podium. Give out cookies and go to podium. Cash out and go to podium. Clear the dishes and go to podium. Set out flowers and go to podium.
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Round 2 - 5 tables
4 tourists - yellow, green, 2 blue - 4
2 tourists - red - 2
2 bookworms - red, blue - 5
4 yappers - 1 blue, 3 red - 1
1 family - 3 - highchair
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Give out chili and lemonade. Take orders. Go to podium while they cook. Pick up the orders and deliver. Give out chili and go to podium. Before cashing out, go to table 1. Take photo if wanted. Cash out all tables. Go to podium. Clear dishes and set out flowers. Go to podium.
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Round 3 - 5 tables
2 tourists - green, yellow - 5
2 bookworms - red - 2
2 bookworms - yellow - 4
2 bookworms - yellow, blue - 3
2 girls - red, green - 1
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Give out chili, take orders and wait at podium. Deliver food and give lemonade. Go to podium. Give any chili if wanted. Then, hand out all cookies. Go to podium. Snap photo for table 5 if wanted. Cash out all tables. Go to podium. Clear tables and go to podium. Set out flowers and go to podium.
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Round 4 - 3 tables
4 girls - 2 yellow, 2 green - 4
4 girls - 2 red, 2 blue - 3
4 women - 2 red, 2 blue - 1
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Give out chili and go to podium. Pick up orders and give lemonade to table 1. Go to podium. Hand out food and lemonade to table 1. Go to podium. Hand out any chili and then cookies (always wait until all hands are up asking for cookies just in case one sneaks a chili while you aren't looking). Go to podium. Cash out all tables. Clear tables and go to podium. Set out flowers. Go to podium.
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Round 5 - 3 tables
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1 girl - green - 4
4 women - blue, yellow, red, green - 1
1 family - 3 - put dad on blue seat - highchair
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Give out chili and take orders. Deliver food and lemonade. Give any chili. Mop table 3. Hand out cookies and then lemonade. Cash out all tables and then clear all tables.
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This gets me between 23,590 and 23,690. My highest is 24,690 but I cannot reproduce it. Good luck!
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NM

I just got to Level 6 on the Coral Cove Cafe and have a "helper" who is taking all my points and I am in story mode. Why is she there and how can I ever beat it when she takes everything?

She is not a helper. It's the beat the waitress round. You have to get more points than her, there are a few ways to do this. Here's some threads about this with helpful tips and hints

http://w ww.playfirst.com/forums/thread/31034
http://w ww.playfirst.com/forums/thread/33637

I hope this helps.
Debz :)