Making a tailgater drive the speed limit is one of life’s simple pleasures.
For travel I’m going to mention games without network access.
Being from F-Droid they are all free and no ads.
I guess the first thing you need to watch out for is making sure the Pixel you buy isn’t tied to a specific cell service provider (carrier unlocked). Here in Canada all our phones are carrier unlocked so I didn’t bother checking into this.
The best source of information about GOS is https://grapheneos.org/usage The site also has an FAQ and the instructions to install the OS.
GrapheneOS also has a forum https://discuss.grapheneos.org/ You don’t need an account to lurk.
If you have specific questions I’m happy to answer or point you in the right direction.
I use a fork of OpenBoard which has glide typing. https://github.com/erkserkserks/openboard/releases/tag/v1.4.4-gesture-typing
GOS camera app works well for me.