I think horizontally oriented pages are all portry as I see names of well known poets. First vertical one is about hanging out with German women and next one is about missing his family. The rest I can't tell, because there's too little to figure out context, might be some everyday events and maybe some patriotic thoughts. If you can't make legible pictures, perhaps you could check out, if there is any Latvian expat organization in your area and see if there is anyone there you can just show the original text.
EDIT: I see you're asking this on Reddit as well, I'd say it's a better idea, since there are more people there, if you would upload everything there in sequence I'm sure others and I as well could help you better
I speak: [flag=]lv[/flag][flag=]en[/flag] I understand some: [flag=]de[/flag][flag=]ru[/flag] Toying with: [flag=]es[/flag]