If you wanted to lock the reports then as I can remember this could be set up through the admin cp. You just change the forums that the guests can see. I would personally set up a new members group in the CP then automatically when say a new member posts say 10 times then they would then automatically change to the Member usergroup and be able to view the gallery. That way you can then get people active on the site who truelly want to know more info about the rivers and ban IP addresses in the CP for users who spam the site. I keep seeing around 15-20 guests showing up all the time so I know I would prefer to gain a few members and lose some guests to boost up site membership and activity