Check out church audio microphones, they are small and really easy to setup, you can get a mounting bar for them, making setup a breeze, and a battery box, church audio preamp, or naiant Tinyhead to power them and get gain. Then a recorder of some sort.
The trick to having a good time, is setup and get levels set, then take a step back and enjoy yourself. For stealth I don't know, I don't do it very often. Just get the mics up on a stand and talk not near them. As for people who want to Talk to you, if your with friends talk with them and don't acknowledge anyone else, and they will leave you alone.