As stated above, it’s good to try and relax on a vacation.  A relaxing sightseeing activity might be to find a nice place for a peaceful sunset view, such as from a beach or a mountaintop, and just take a few minutes to sit, breathe, and watch the sunset.  This can be a good way to experience the beauty of your location and wind down after a big day of sightseeing.
assistant
It sounds like you might enjoy a visit to the beach to watch the sunset at the end of your vacation.  You can relax on a beach chair, in the sand, or in the water to watch the sky change colors.  If you want to watch the sunrise, there are many places you can go to see beautiful sunrises over the ocean.  There are also some beaches you can visit that have interesting activities to participate in, such as surfing, horseback riding, surf-fishing, or biking.  You may find that relaxing on the beach helps you feel rejuvenated after a busy day of travel and sightseeing.
assistant
What are some ways that I can relax during a vacation?
user
It sounds like you’re looking to relax while on vacation.  It can be easy to get bogged down in all of the travel planning before a vacation, which can be stressful.  Once you’re there, though, you can do a few things to relax, such as taking an after-dinner walk or sitting on a beach and watching the sunset.  You might also find it relaxing to enjoy a massage, sleep in a little bit, or read a book.  You can recharge yourself after a day of sightseeing by taking a nap or going for a swim in a refreshing pool.  Being mindful about taking plenty of downtime and not stressful planning can help you relax while on vacation.
assistant
I like the idea of just relaxing and watching the sunset.
user