Absolutely! These are some fantastic destinations in Romania and I'm sure you will enjoy your visit. Here are some travel tips for you:

Best Time to Visit:
The best time to visit Baia Mare, Sighetu Marmatiei, Sapânta would generally be in late spring (April and May) when the weather is quite pleasant, and then again in early fall (September and October) when the leaves change colors.

Route and Accessibility:
Baia Mare and Sighetu Marmatiei are well-connected, being just about a 1-hour drive from each other. From Sighetu Marmatiei, you can easily reach Sapânta by car in about 30 minutes.

Altitude and Acclimatization:
These places are not located at a very high altitude, so you do not need to worry about acclimatization. However, if you have health issues, it is always wise to consult with a healthcare provider before your trip.

Accommodation and Booking:
There are plenty of accommodation options in all these places, including hotels, guesthouses and homestays. Ensure to book your accommodation in advance, especially during peak tourist seasons.

Clothing and Essentials:
Pack clothes suitable for the weather during your visit. Always carry an umbrella or raincoat as Romanian weather can be unpredictable sometimes.

Health and Safety:
Carry a basic first aid kit, medicines (if you're on any), and keep emergency contact numbers handy. Romania is generally a safe country, but it's always good to be cautious.

Local Etiquette and Respect:
People in Romania are warm and welcoming. Respect their local customs and traditions. Learn a few basic Romanian phrases, it can help you to connect with locals. Additionally, always ask for permission before photographing people.