What makes you think that Israelis can just "take a stroll" in a foreign country without asking permission (passport, visa, etc.)?

Anyway, there are Jewish journalists who have visited and spent time in Gaza. Here's Dan Cohen (precisely on the topic of safety of Jews in Gaza):

https://mondoweiss.net/2015/06/jewish-reporter-responds/#sth...

Here's Max Blumenthal:

https://globalvoices.org/2014/08/16/journalists-visit-gaza-t...

Here's Anthony Loewenstein:

https://mondoweiss.net/2009/07/hope-lives-in-gaza-despite-si...

Then there is Amira Hass, who actually lives in Ramallah and has reported from Gaza. These are the ones I know, there are certainly others.