Hi ktrack,
I do something similar with gas stops. I make it a point to use Gas Bars (eg. SuperStore, Extra Foods, Real Cdn Warehouse) when travelling in western Canada. I look up their locations online for their addresses and use the addresses to get an initial location. That usually gets me close enough that I can get a visual on the store. When I get to the actual location I change the waypoint to have the actual GPS lat/long reading. I have nearly three dozen of them in Saskatchewan, Alberta and British Columbia with the actual locations from my own usage now.
I have created actual waypoints for the motels and restaurants that we liked, in case we get back that way again. And I have quite a collection of actual waypoints for golf courses.
If I want to be pretty sure of the location of something in advance I use Google Maps. You can't fool a satellite photo! It's pretty easy to verify the actual location of things like large stores, RV parks, hotels (and golf courses!) in a satellite image. I was even able to use Google Maps satellite images to verify the location of a friend's place (.8 acre lot) on Vancouver Island for a trip last month. The address he gave me wasn't searchable in any of the many GPS maps I have. I could only get the nearest intersection.
If you go to the web site of pretty much any hotel, bed&breakfast or RV park they will have a page that describes their location. It usually has the address but will normally also include a nearby intersection or other descriptive terms like "across the road from the Casino" or other similar large and obvious landmark. There is nearly always something descriptive enough to help find it in Google Maps' satellite images.
When I've located what I want in Google Maps I manually create a waypoint with the lat/long from the screen. Even though the calibration of Google's satellite images can sometimes be as much as 1/2 mile off, it's always been close enough for me to get a visual.
There are so many good tools out there for trip planning ... an embarrassment of riches. :clap:
...ken...