Beach running is much better at resorts in the zone to the south or by puerto morales . It’s cluttered by TTR and ya have to cross the causeway south/west of the resort. Sidewalk is fun...ya, better to go left from resort. Right will lead you into town and some questionable areas if ya want to go out for several miles.
I love to run and do so when at home, but honestly from past experience, there is no way in hell I could ever run after the drinking and partying we do each day and night
Drinking beers laying on the floor of the shower with the water running. That's a move I have perfected! It is easier on the joints...(side note, those help too)
My wife and I just go to the spa in the morning and alternate the steam room and dry sauna to sweat out the night before activities. Works like a charm