The following were clarified in the October Ingress AMA:
Do coin-operated machine play areas in front of stores and in malls make acceptable portal candidates? This is similar to the restaurants' play area question - if this is a publicly accessible play area in the mall, yes. If it's part of a commercial business, no.
Are piers/fishing docks/boat launches at parks being acceptable portal candidates? If there is a signboard for the location and there's pedestrian access to the sign, yes.
What about wooden walking trail bridges throughout a park or nature preserve on the trail/path? If they are accessible by foot and expected to be used as part of the trail, they would meet the criteria.
While little free libraries are valid portal candidates, what about blessing boxes (miniature food and hygiene banks)? At this time no. Libraries are part of our criteria and are included as a nod to education and discovery. Blessing boxes would not fall into this category.
Are charity headquarters valid candidates? If they have cultural significance or have done something significant for the community, sure. Just make sure the Wayspot description mentions the significance to help other reviewers take the call.
Do structures that meet the same usage as Gazebos such as pergolas, pavilions, ramadas, arbors, etc fit acceptance criteria? If it's in a park and has pedestrian access, yes. If they are in the backyard of your private residence, no.
Places like schools and private property say that we are to deny all nominations on those properties. Does this precedent extend to the denials that we are supposed to do on "Adult orientated Businesses" (strip clubs, liquor stores)? Example, a mural is painted on the wall of a marijuana shop. Are we to deny the mural because it's on a place that should not be accepted or are we to not worry about what type of business that it's on? The businesses themselves may not meet criteria since they would fall under generic businesses. A mural or candidate not related to the business should be reviewed on its own merit.