touristisch
touristic
Relates to tourism or tourists, or is intended for them.
Die Stadt hat eine hervorragende touristische Infrastruktur.
The city has excellent touristic infrastructure.

touristic / touristy
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touristic
Relates to tourism or tourists, or is intended for them.
Die Stadt hat eine hervorragende touristische Infrastruktur.
The city has excellent touristic infrastructure.

The adjective 'touristisch' (touristic/touristy) is derived directly from the nouns 'der Tourist' (the tourist) and 'der Tourismus' (tourism). The ending '-isch' turns it into an adjective meaning 'in the manner of / related to'.
Die Region lebt hauptsächlich vom Tourismus und hat viele touristische Angebote.
The region lives mainly from tourism and has many touristic offerings.
In its neutral, descriptive meaning, 'touristisch' (touristic) is often combined with nouns such as 'Attraktion' (attraction), 'Infrastruktur' (infrastructure), 'Zentrum' (center), or 'Angebot' (offering).
Der Eiffelturm ist die bekannteste touristische Attraktion in Paris.
The Eiffel Tower is the best-known touristic attraction in Paris.
When a place is described as 'zu touristisch' (too touristy), this often has a negative meaning. It then means that the place is overcrowded, expensive, or no longer authentic.
Diese kleine Bucht war früher ein Geheimtipp, aber heute ist sie mir zu touristisch.
This little bay used to be an insider tip, but today it is too touristy for me.
You often find the neutral meaning in official texts such as travel guides. The evaluative, often negative meaning is more likely to appear in personal opinions, blogs, or conversations.
Die Broschüre beschreibt die touristischen Routen der Region.
The brochure describes the touristic routes of the region.
authentic
'authentisch' and 'touristisch' are often contrasted when talking about travel. 'authentisch' then means that something feels real, original, or not made especially for visitors. 'touristisch' means that something has to do with tourism, is intended for tourists, or is strongly shaped by tourists. The words can be confused because both can describe places, food, or experiences. In travel contexts, the contrast is important: an authentic restaurant feels local, while a touristy restaurant is more geared toward visitors.

Die Altstadt ist schön, aber im Sommer sehr touristisch.
The old town is beautiful, but very touristy in summer.
In dem Dorf haben wir ein authentisches Fest mit lokaler Musik erlebt.
In the village, we experienced an authentic festival with local music.