Can you please check my sentences together with a few more points I need to include in my project work?

Question

1) I really hope you had a good journey back home.
All our teachers have been enthusiastic about your visit and your principal's words about the project! 
2) They will never forget your presence here.
However, I still believe that we should have included Finland as a partner, too.
3) By the way, I'm attaching to my email the presentation of the Finnish school as received by the school principal.
4) Over the weekend I mananaged to write a few more things on the objectives of our project. I think you should organize them in: general objectives, scientific objectives and linguistic objectives.
5)cooperate with students from different class and age groups to  complete their tasks 
6)increase their self-esteem, autonomy and team spirit 
consider  the project as part of  the 
regular activities of the school curriculum

Writeacher · Answer

I really hope you had a good journey back home. All our teachers are enthusiastic about your visit and your principal's words about the project! They will never forget your presence here.
(I have deliberately omitted the negative sentence here.)

I'm attaching the Finnish school's presentation as received by the school principal.

4) Over the weekend I mananaged to write a few more details for our project's objectives. I think you should organize them into these categories: general objectives, scientific objectives, and linguistic objectives.

5) work and study cooperatively with students from different class and age groups to complete their tasks

6) increase students' autonomy and team spirit
(I removed "self-esteem" because I believe that all people need to develop self-esteem by means of success in their work/study. To work on self-esteem as a separate topic is to work on false or insincere praise -- not a good thing. " target="_blank">http://www.functionalpathtrainingblog.com/2010/06/lowering-the-bar-false-praise.html)

consider the project as part of the
regular activities of the school curriculum