Hi Lotus! I love your name, and I think it's great that you're jumping into the STR game! We manage properties in the Indianapolis, IN area.
Amenities- depending on the market, a hot tub could be a great addition to your STR. I would look at comps in the area and see if other STRs are doing well with hot tubs. If you are marketing your property as kid or dog friendly, buy things that coincide with that like high chair, kids plates, cups, silverware, kid games, and maybe some kid proofing like outlet covers. Or, dog bowls, dog treats, toys, doggie bags for mess clean up in yard, etc.
Guest experience- We have hired VAs that do 24/7 messaging, so guest always have access to someone, we also have an Instacart+ membership so we are able to send anything over if they need it (like if our cleaners didn't put out enough toilet paper, etc.). A big part of guest experience is design and functionality of the home. Making the home look good with design and make sure people can be comfortable there will always help.
Seasonal strategies- Almost all of our properties are hybrid. So, we have them listing as STR in the more busy seasons, and we transition them into MTRs during the winters, or slower seasons. It certainly doesn't work with each listing, but that is what we do with the majority and it is consistent income during a slow season.
Best of luck!!! :)