A while back I wrote a post about utilizing custom Google Maps: The Innkeeper as Concierge or Custom Google Maps and leveraging them for lodging I suggest you read that and then come back here to enhance a map or two with some additional ideas.
In addition to the suggestions of things to do (as lists) with custom maps, you can also enhance them by linking each mapped item with a specific blog post, if you are using your blog to talk about things to do in the area, area attractions and more.
As an example, last month you wrote about a restaurant that just opened down the road from you, in addition to adding it to a custom Google map of local restaurants, you can also use the additional information box to link to your blog post.
Google also lets you change the pins to different graphics, including letting you upload your own (suggested if you want to get fancy) or linking to another source (caveat, the image links might change and the image will become Xed out) to indicate attractions, etc.
Linking your blog posts to the area activities/attractions/points of interest and using the custom link that Google spits out for each custom map, gives a potential guest (if you are sending it to them by email, or showing them in person) the opportunity to read a post you have written specifically about the topic, as well as giving them location, contact information and generally the website (which you can add to the listing if Google doesn’t have it listed) so that they don’t have to go searching for it.
You may have had a specific point about the local trail riding service and in your blog post recommend asking for a specific horse (or two), which gives the guest added value as it’s referenceable. Or you may have skied a local ski area and commented about the best groomed (and least used) trails on your blog post.
There is some added SEO (search engine optimization value as well).
For an example of custom Google Map (linked to blog posts) that I am currently working on: https://maps.google.com/maps/ms?msid=201713576815666313940.0004d1d9cb66003d60a27&msa=0&ll=42.67032,-72.864075&spn=1.53075,2.754822