Staying at LaConcha Marriot Renaisance for 3 nights with full 2 days. What to wear? Where to eat? Must do's. Any ideas? Please advise. Alone during day while son works. Will be eating at night with him. Would you advise horseback riding trip. Did one day in Old San Juan on a walking tour last time I took a cruise. Do you recommend any particular service to get from airport to hotel? Prices? Thanks for all input.