The hotels I stay at while traveling usually have a exercise room. I also look for trails, parks, or Planet Fitness gyms (since I have a membership). Walking in the stores and specialty shops also helps with the exercise.
Once when hubby and I were camping out in our RV, I brought along one set of dumbbells (just a comfortable weight) to exercise with. I also bring my bike for riding around! Take walks on trails, etc. There is always a way!
Are you going on a trip? If so, maybe you can tell us what you're doing and how you're traveling?
I know cruises, for example, are an easy method to stay active on. They have gyms on the ship! Most of the large boats I've been on have them at the front of the ship. I'm a dork and pretend like my exercising is powering the vessel. LOL. They also offer classes, usually for a fee and there is usually a walking track on one of the decks. Also, if you choose excursions, you can choose more active ones.
If staying in a hotel, many offer gyms. You can also find work outs using towels or resistance bands are portable. You can walk and run in the area;hotel staff can point out routes. Look for parks in the area and do a "park workout" utilizing the playground equipment.
Just curious to hear some different perspectives on working out when away from home, whether on business, vacation, etc. I know there's always the option of just getting creative and doing bodyweight exercises, but it'd be nice if it was easier to find gyms on the road that don't charge ~$20-$40 for a one-day pass.