Well, it is similar to "on" in French (in case you know this language).
"A gente" is used to mean WE all the time. So, it includes the speaker. But, pay attention: though "a gente" means more than one person, it is a singular noun, so the verb is also conjugated in singular: a gente VAI ao parque
It makes things easier
- ele/ela/você/a gente vai ao parque (he/she/you/we go(es) to the park).
Then you do not need to memorize many verb conjugations!