Willow City Loop, north of Fredericksburg is a great place to see wildflowers. Just google Willow City Loop and you will get the Fredericksburg site to which Willow City is linked. The flowers are beautiful, but the Hill Country is a beautiful backdrop for the flowers. Fredericksburg is a fun town to visit, it has a well preserved German heritage, always something going on there. A really nice KOA is just east of town. Lady Bird Johnson Municipal Park is on the other side of town. I don't think they have sewer, but the sites are shaded and there is a golf course and maybe a pool, not sure about that. There is another park, Oak Park??? I am not sure of the name. It is tight, I think, not my favorite. There are some others, just don't know their names. If you want to stay at Lady Bird, you should probably get reservations as soon as you know your dates. Hopefully we'll get some fall and winter rain so the flowers will be abundant. If you do get to Fredericksburg, be sure to visit the Nimitz Museum. It is wonderful, Chester A Nimitz was from Fredericksburg. Plan to spend at leastt 2-4 hrs. there, it is extensive. You can also visit Luckenbach, which is just a few miles out of Fredericksburg. If the flowers are good, you'll see them on the drive there, for that matter on most any drive around there. As far as when, as in leaves changing in New England and elsewhere, it just depends on the weather. Generally the first two weeks in April are good, and perhaps some of those websites will be of some help. I might add, the third week in April is a huge city wide party in San Antonio, Fiesta. There are numerous events, NIOSA, being just one. Music, food, and fun are the order of the day! There are 3 parades, two evening and one daytime. My favorite is the Monday night river parade, but that's just mine. Google, Fiesta San Antonio for the schedule. NIOSA is always Tues.-Fri., if you do go to NIOSA, I would encourage you to go on Tues pm, and Wed. Is OK, but it is wild on Thurs. and Fri. Good luck with the flowers, hope they will be beautiful for you, but for us too, as that will mean we have had rain, which we desperately need!