Hi! You could check out the Places to Visit Tab above for information on best places around Manali. During May-June, it's summertime. So you may not get snow and winter activities, but this is the perfect time for sightseeing, paragliding, trekking, river rafting and other adventure sports. This is the time when the flowers are in full bloom making it a picturesque place. Booking a cab is possible, but some places may require some amount of trekking. It might be quite expensive to book a cab for 4 days for sightseeing, as sightseeing charges per day for various places around Manali range from around INR 2000 - INR 5000, or more depending on your preferences. You could check out the Packages Tab above for packages in Manali that include sightseeing, which might be cheaper.