@Giuseppina90
I just leave a few random brochures and pamphlets on a shelf and casually tell guests "I've never been on any of these tours and have no idea how good or bad they are (lol~) but I thought the brochures might help you if you need ideas for what to see or do. You can decide to either book tours or sightsee on your own, it's all really up to you 🙂 " and just leave it at that.
I try not to get involved in the actual booking process, if a guest decides to book a tour. I will help if they need assistance navigating the booking site for bus/train tickets or an entrance ticket but that's about it. I do provide a lot of information, links, make suggestions etc. but never anything too specific.