Suggestion of Netherland​s Schedule

I plan to visit Netherlands during 9/13-9/20, and this is my schedule as below,9/13 [Fri] Belgium > AMS9/14-15 AMS9/16 [Mon] AMS > Giethoorn 9/17 [Tues] Giethoorn > Utrecht > 鹿特丹9/18 [Wed] 鹿特丹> 小孩堤防> 鹿特丹9/19 [Thurs 鹿特丹> 海牙> 代尔夫特> 莱登>海牙9/20 [Fri] 海牙> Belgium
* If I request to the "Day-Ticket" insted to AMS > Giethoorn, I won't stay in Giethoorn on 9/16.
This is my first time to visit Netherlands, I have to questions, please kindly give me some advice.
1. How is the schedule plan, do I need to change the detail?
2. I think I need to buy "Day-Ticket(AH?)", but I don't know how many "Day-Ticket" do I need is suitable.

Thank you very much!!!!